revert build fixes, downgrade permission_handler (sdk 30)

filcnaplo/android/build.gradle

@@ -2,8 +2,8 @@ buildscript {
     ext.kotlin_version = '1.3.50'
 
     ext {
-        compileSdkVersion   = 31
-        targetSdkVersion    = 31
+        compileSdkVersion   = 30
+        targetSdkVersion    = 30
         appCompatVersion    = "1.1.0"
     }
 
@@ -13,7 +13,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.0.2'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
@@ -33,8 +33,8 @@ subprojects {
     afterEvaluate {project ->
         if (project.plugins.hasPlugin('android') || project.plugins.hasPlugin('android-library')) {
             android {
-                compileSdkVersion 31
-                buildToolsVersion '31.0.0'
+                compileSdkVersion 30
+                buildToolsVersion '30.0.3'
             }
         }
     }