[image_picker_android] Remove `jetifier` and `enableUnitTestBinaryResources` from gradle properties (#5889)

diff --git a/packages/image_picker/image_picker_android/example/android/gradle.properties b/packages/image_picker/image_picker_android/example/android/gradle.properties
index 6effed0..d12b9a8 100755
--- a/packages/image_picker/image_picker_android/example/android/gradle.properties
+++ b/packages/image_picker/image_picker_android/example/android/gradle.properties
@@ -1,5 +1,3 @@
 org.gradle.jvmargs=-Xmx1536M
 android.enableR8=true
 android.useAndroidX=true
-android.enableJetifier=true
-android.enableUnitTestBinaryResources=true