Travis: Filter out another string, still noisy

That should leave only the `extracting:` lines of the verbose unzip,
should be enough to keep Travis awake.

.travis.yml

@@ -70,7 +70,7 @@ before_script:
   - if [ "$TRAVIS_OS_NAME" = "osx" ]; then brew update; brew install scons; fi
   - if [ "$TRAVIS_OS_NAME" = "osx" ] && [ "$GODOT_TARGET" = "android" ]; then
       brew update; brew install -v android-sdk;
-      brew install -v android-ndk | grep -v inflating;
+      brew install -v android-ndk | grep -v "inflating:" | grep -v "creating:";
       export ANDROID_HOME=/usr/local/opt/android-sdk; export ANDROID_NDK_ROOT=/usr/local/opt/android-ndk;
     fi