CI: No more need to set ADB_INSTALL_TIMEOUT

The default was bumped in the Android plugin version 2.0.0, so we are
safe now.

.gitlab-ci.yml

@@ -30,7 +30,7 @@ connectedCheck:
     - ./tools/wait-for-emulator
     - adb shell input keyevent 82 &
     - export EXITVALUE=0
-    - ADB_INSTALL_TIMEOUT=8 ./gradlew connectedCheck -PdisablePreDex || {
+    - ./gradlew connectedCheck -PdisablePreDex || {
         adb -e logcat -d '*:E';
         echo "get the full logcat here:";
         adb -e logcat -d | curl --silent -F 'clbin=<-' https://clbin.com;