debug: preserve focus in editor when integrated terminal is shown so match debug console behavior and to make sense for accessibility

fyi @weinand

src/vs/workbench/api/node/extHostDebugService.ts

@@ -104,7 +104,7 @@ export class ExtHostDebugService extends ExtHostDebugServiceBase {
 				cwdForPrepareCommand = args.cwd;
 			}
 
-			terminal.show();
+			terminal.show(true);
 
 			const shellProcessId = await terminal.processId;