Update ScriptAnalyzerBuiltinRules.csproj

Avoid OneCharNames in the project file

Author: yutingc

Rules/ScriptAnalyzerBuiltinRules.csproj

@@ -54,7 +54,6 @@
     <Compile Include="AvoidEmptyCatchBlock.cs" />
     <Compile Include="AvoidGlobalVars.cs" />
     <Compile Include="AvoidInvokingEmptyMembers.cs" />
-    <Compile Include="AvoidOneCharNames.cs" />
     <Compile Include="AvoidPositionalParameters.cs" />
     <Compile Include="AvoidReservedCharInCmdlet.cs" />
     <Compile Include="AvoidReservedParams.cs" />