fixed typo in file name

Author: retailcoder

Rubberduck.Parsing/Rubberduck.Parsing.csproj

@@ -149,7 +149,7 @@
     <Compile Include="Symbols\DebugDeclarations.cs" />
     <Compile Include="Symbols\AliasDeclarations.cs" />
     <Compile Include="Symbols\FormEventDeclarations.cs" />
-    <Compile Include="Symbols\ICustomDelarationLoader.cs" />
+    <Compile Include="Symbols\ICustomDeclarationLoader.cs" />
     <Compile Include="Symbols\Identifier.cs" />
     <Compile Include="Binding\IBindingContext.cs" />
     <Compile Include="Binding\IBoundExpression.cs" />