Fix icon color, rebuild icons

android/app/src/main/res/mipmap-hdpi/ic_launcher.png

android/app/src/main/res/mipmap-mdpi/ic_launcher.png

android/app/src/main/res/mipmap-xhdpi/ic_launcher.png

android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png

android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png

assets/icons/button_back.png

assets/icons/button_help.png

assets/icons/button_start.png

assets/icons/game_fail.png

assets/icons/game_win.png

fastlane/metadata/android/en-US/images/icon.png

icons/icon.svg