Removing redundant backticks in flutter\packages\flutter_tools\gradle\gradle.kts (#159051)

`what android studio lint is failing ?`

![Capture d’écran 2024-11-19
110315](https://github.com/user-attachments/assets/d86605f6-0060-4721-9233-09d8ec5774d4)

![Capture d’écran 2024-11-19
110338](https://github.com/user-attachments/assets/7ee7465e-7a06-43db-bebb-ca87dda3cdc8)
see #147122
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packages/flutter_tools/gradle/build.gradle.kts

@@ -4,7 +4,7 @@
 
 plugins {
     `java-gradle-plugin`
-    `groovy`
+    groovy
 }
 
 group = "dev.flutter.plugin"