CI: 4.4 says it's ready before it actually is

Its boot animation is "stopped" but on my laptop the CPU is still at 100%,
which means it's probably still working and not ready yet. The tests fail if
you run them right after wait-for-emulator is done. If you wait a few seconds
though, they do work since the CPU load drops.

Until we can figure out a better solution, have a generous 30-second sleep
after it tells us it's ready.

.gitlab-ci.yml

@@ -44,6 +44,7 @@ test:
     - emulator -force-32bit -avd fcl-test -no-skin -no-audio -no-window &
     - ./F-Droid/tools/wait-for-emulator
     - adb shell input keyevent 82
+    - sleep 30 # 4.4 says it's ready before it actually is
     - echo " == Running Android tests on the 4.4.4 emulator"
     - ADB_INSTALL_TIMEOUT=8 gradle connectedCheck
     - echo " == Stopping Android 4.4.4 emulator"