Disable VSCode completion case matching (#390)

This restores previous behavior.
https://www.chiefdelphi.com/t/need-some-help-with-vs-code-autocomplete-features/451055

WPILibInstaller-Avalonia/ViewModels/InstallPageViewModel.cs

@@ -312,6 +312,7 @@ private async Task ConfigureVsCodeSettings()
             SetIfNotSet("update.mode", "none", settingsJson);
             SetIfNotSet("update.showReleaseNotes", false, settingsJson);
             SetIfNotSet("http.systemCertificates", false, settingsJson);
+            SetIfNotSet("java.completion.matchCase", "off", settingsJson);
 
             string os;
             string path_seperator;