Update blazor templates for preview7 (#11691)

Author: ajaybhargavb

src/Components/Blazor/Templates/src/content/BlazorHosted-CSharp/BlazorHosted-CSharp.Client/Pages/Counter.razor

@@ -4,7 +4,7 @@
 
 <p>Current count: @currentCount</p>
 
-<button class="btn btn-primary" @onclick="@IncrementCount">Click me</button>
+<button class="btn btn-primary" @onclick="IncrementCount">Click me</button>
 
 @code {
     int currentCount = 0;

src/Components/Blazor/Templates/src/content/BlazorHosted-CSharp/BlazorHosted-CSharp.Client/Shared/NavMenu.razor

@@ -1,11 +1,11 @@
 <div class="top-row pl-4 navbar navbar-dark">
     <a class="navbar-brand" href="">BlazorHosted-CSharp</a>
-    <button class="navbar-toggler" @onclick="@ToggleNavMenu">
+    <button class="navbar-toggler" @onclick="ToggleNavMenu">
         <span class="navbar-toggler-icon"></span>
     </button>
 </div>
 
-<div class="@NavMenuCssClass" @onclick="@ToggleNavMenu">
+<div class="@NavMenuCssClass" @onclick="ToggleNavMenu">
     <ul class="nav flex-column">
         <li class="nav-item px-3">
             <NavLink class="nav-link" href="" Match="NavLinkMatch.All">

src/Components/Blazor/Templates/src/content/BlazorStandalone-CSharp/Pages/Counter.razor

@@ -4,7 +4,7 @@
 
 <p>Current count: @currentCount</p>
 
-<button class="btn btn-primary" @onclick="@IncrementCount">Click me</button>
+<button class="btn btn-primary" @onclick="IncrementCount">Click me</button>
 
 @code {
     int currentCount = 0;

src/Components/Blazor/Templates/src/content/BlazorStandalone-CSharp/Shared/NavMenu.razor

@@ -1,11 +1,11 @@
 <div class="top-row pl-4 navbar navbar-dark">
     <a class="navbar-brand" href="">BlazorStandalone-CSharp</a>
-    <button class="navbar-toggler" @onclick="@ToggleNavMenu">
+    <button class="navbar-toggler" @onclick="ToggleNavMenu">
         <span class="navbar-toggler-icon"></span>
     </button>
 </div>
 
-<div class="@NavMenuCssClass" @onclick="@ToggleNavMenu">
+<div class="@NavMenuCssClass" @onclick="ToggleNavMenu">
     <ul class="nav flex-column">
         <li class="nav-item px-3">
             <NavLink class="nav-link" href="" Match="NavLinkMatch.All">

src/ProjectTemplates/Web.ProjectTemplates/content/RazorComponentsWeb-CSharp/Pages/Counter.razor

@@ -4,7 +4,7 @@
 
 <p>Current count: @currentCount</p>
 
-<button class="btn btn-primary" @onclick="@IncrementCount">Click me</button>
+<button class="btn btn-primary" @onclick="IncrementCount">Click me</button>
 
 @code {
     int currentCount = 0;

src/ProjectTemplates/Web.ProjectTemplates/content/RazorComponentsWeb-CSharp/Shared/NavMenu.razor

@@ -1,11 +1,11 @@
 <div class="top-row pl-4 navbar navbar-dark">
     <a class="navbar-brand" href="">RazorComponentsWeb-CSharp</a>
-    <button class="navbar-toggler" @onclick="@ToggleNavMenu">
+    <button class="navbar-toggler" @onclick="ToggleNavMenu">
         <span class="navbar-toggler-icon"></span>
     </button>
 </div>
 
-<div class="@NavMenuCssClass" @onclick="@ToggleNavMenu">
+<div class="@NavMenuCssClass" @onclick="ToggleNavMenu">
     <ul class="nav flex-column">
         <li class="nav-item px-3">
             <NavLink class="nav-link" href="" Match="NavLinkMatch.All">