remove bad merge on SNIStreams.NetStandard

Author: Wraith2

src/Microsoft.Data.SqlClient/netcore/src/Microsoft.Data.SqlClient.csproj

@@ -310,7 +310,6 @@
     <Compile Include="Microsoft\Data\SqlClient\SNI\SslOverTdsStream.NetStandard.cs" />
     <Compile Include="Microsoft\Data\SqlClient\SNI\SNIStreams.Task.cs" />
     <Compile Include="Microsoft\Data\SqlClient\Reliability\SqlConfigurableRetryLogicManager.NetStandard.cs" />
-    <Compile Include="Microsoft\Data\SqlClient\SNI\SNIStreams.NetStandard.cs" />
 	</ItemGroup>
 	<ItemGroup Condition="'$(OSGroup)' != 'AnyOS' AND '$(TargetFramework)' != 'netstandard2.0'">
     <Compile Include="..\..\src\Microsoft\Data\SqlClient\AlwaysEncryptedAttestationException.cs">