Remove deprecated buildConfig flag from gradle.properties

Author: ekkilm

gradle.properties

@@ -18,6 +18,5 @@ org.gradle.jvmargs=-Xmx1536m
 
 android.useAndroidX=true
 android.enableJetifier=true
-android.defaults.buildfeatures.buildconfig=true
 android.nonTransitiveRClass=false
 android.nonFinalResIds=false