[Macros] Update a test case for ABI name changes

JSON decoder's error message include the ABI name specified by
'-module-abi-name'.

Author: rintaro

test/Macros/macro_plugin_error.swift

@@ -32,9 +32,10 @@
 
 func test() {
   // FIXME: Should be more user friendly message.
+  // FIXME: -module-abi-name ABI name is leaking.
 
   let _: String = #fooMacro(1)
-  // expected-error @-1 {{typeMismatch(SwiftCompilerPluginMessageHandling.PluginToHostMessage}}
+  // expected-error @-1 {{typeMismatch(CompilerSwiftCompilerPluginMessageHandling.PluginToHostMessage}}
   let _: String = #fooMacro(2)
   // expected-error @-1 {{failed to receive result from plugin (from macro 'fooMacro')}}
   let _: String = #fooMacro(3)