Reproducible builds: disable PNG crunching.

https://developer.android.com/studio/build/optimize-your-build#disable_crunching

build.gradle

@@ -57,10 +57,6 @@ android {
         viewBinding true
     }
 
-    aaptOptions {
-        cruncherEnabled = false
-    }
-
     defaultConfig {
         applicationId "de.dennisguse.opentracks"
         versionCode 4692
@@ -68,7 +64,6 @@ android {
 
         buildConfigField "String", "VERSION_NAME_FULL", "\"${getVersionName()}\""
 
-
         minSdkVersion 21
         targetSdkVersion 31
 
@@ -98,6 +93,7 @@ android {
         }
 
         release {
+            crunchPngs false
             minifyEnabled false
         }