Cleaned up some warnings in IPA.exe

Common.props

@@ -5,7 +5,7 @@
     <!--<PathMap>$(SolutionDir)=C:\</PathMap>-->
     <DebugType>portable</DebugType>
     <LangVersion>9</LangVersion>
-    <NoWarn>CA1031;CA1305</NoWarn>
+    <NoWarn>CA1031;CA1305;CA1303</NoWarn>
     <Nullable>disable</Nullable>
     <WarningsAsErrors>$(WarningsAsErrors);nullable</WarningsAsErrors>
     <AnalysisMode>AllEnabledByDefault</AnalysisMode>

IPA/Program.cs

@@ -92,7 +92,7 @@ namespace IPA
                 }
                 AppDomain.CurrentDomain.AssemblyResolve += AssemblyLibLoader;
 
-                var argExeName = Arguments.CmdLine.PositionalArgs.FirstOrDefault(s => s.EndsWith(".exe"));
+                var argExeName = Arguments.CmdLine.PositionalArgs.FirstOrDefault(s => s.EndsWith(".exe", StringComparison.OrdinalIgnoreCase));
                 argExeName ??= new DirectoryInfo(Directory.GetCurrentDirectory()).GetFiles()
                             .FirstOrDefault(o => o.Extension == ".exe" && o.FullName != Assembly.GetEntryAssembly()!.Location)
                             ?.FullName;