Disable jetifier.

Jetifier is no longer needed and is causing failures for the encoders
proto plugin.

Author: vkryachko

gradle.properties

@@ -13,10 +13,6 @@
 # limitations under the License.
 org.gradle.jvmargs=-Xmx8g -XX:MaxPermSize=8g
 
-android.enableJetifier=true
-android.useAndroidX=true
-android.jetifier.blacklist=errorprone,firebase-encoders-processor
-
 org.gradle.parallel=true
 org.gradle.caching=true