Use an EquivalenceKey for 'InlineDeclaration' so we don't get multiple...

Use an EquivalenceKey for 'InlineDeclaration' so we don't get multiple offerings of the same fix on a single line.

src/Features/CSharp/Portable/InlineDeclaration/CSharpInlineDeclarationCodeFixProvider.cs

@@ -275,7 +275,9 @@ private static IEnumerable<SyntaxTrivia> MassageTrivia(IEnumerable<SyntaxTrivia>
         private class MyCodeAction : CodeAction.DocumentChangeAction
         {
             public MyCodeAction(Func<CancellationToken, Task<Document>> createChangedDocument) 
-                : base(FeaturesResources.Inline_variable_declaration, createChangedDocument)
+                : base(FeaturesResources.Inline_variable_declaration,
+                       createChangedDocument,
+                       FeaturesResources.Inline_variable_declaration)
             {
             }
         }