migrate to new buildConfig flag

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

app/build.gradle

@@ -129,6 +129,7 @@ android {
 
     buildFeatures {
         viewBinding true
+        buildConfig = true
     }
 
     lint {

gradle.properties

@@ -35,7 +35,6 @@ org.gradle.jvmargs=-XX:MaxHeapSize\=2048m -Xmx2048m
 
 android.useAndroidX=true
 android.enableJetifier=true
-android.defaults.buildfeatures.buildconfig=true
 android.nonTransitiveRClass=false
 android.nonFinalResIds=false