fix: stop uia2 process as well in cleanupAutomationLeftovers (#807)

Author: KazuCocoa

lib/uiautomator2.js

@@ -413,7 +413,10 @@ class UiAutomator2Server {
     }
 
     try {
-      await this.adb.forceStop(SERVER_TEST_PACKAGE_ID);
+      await B.all([
+        this.adb.forceStop(SERVER_PACKAGE_ID),
+        this.adb.forceStop(SERVER_TEST_PACKAGE_ID)
+      ]);
     } catch (ignore) {}
     if (strictCleanup) {
       // https://github.com/appium/appium/issues/10749