Gelocator: ndkversion set to default

Author: lekshmanmj

client/android/app/build.gradle

@@ -25,7 +25,7 @@ if (flutterVersionName == null) {
 android {
     namespace "com.appveyor.flet"
     compileSdkVersion flutter.compileSdkVersion
-    ndkVersion "25.1.8937393"
+    ndkVersion flutter.ndkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8