Use defaultUri scheme for window scheme

Fixes microsoft/vscode-internalbacklog#1179

src/vs/workbench/services/dialogs/browser/abstractFileDialogService.ts

@@ -230,12 +230,12 @@ export abstract class AbstractFileDialogService implements IFileDialogService {
 		return remoteFileDialog.showSaveDialog(options);
 	}
 
-	protected getSchemeFilterForWindow(): string {
-		return !this.environmentService.configuration.remoteAuthority ? Schemas.file : REMOTE_HOST_SCHEME;
+	protected getSchemeFilterForWindow(defaultUriScheme?: string): string {
+		return !this.environmentService.configuration.remoteAuthority ? (!defaultUriScheme || defaultUriScheme === Schemas.file ? Schemas.file : defaultUriScheme) : REMOTE_HOST_SCHEME;
 	}
 
 	protected getFileSystemSchema(options: { availableFileSystems?: readonly string[], defaultUri?: URI }): string {
-		return options.availableFileSystems && options.availableFileSystems[0] || this.getSchemeFilterForWindow();
+		return options.availableFileSystems && options.availableFileSystems[0] || this.getSchemeFilterForWindow(options.defaultUri?.scheme);
 	}
 
 	abstract pickFileFolderAndOpen(options: IPickAndOpenOptions): Promise<void>;