[ImgBot] Optimize images

*Total -- 151.81kb -> 98.41kb (35.18%)

/assets/2x/mod_tags.png -- 3.84kb -> 1.78kb (53.49%)
/assets/1x/mod_tags.png -- 2.96kb -> 1.38kb (53.36%)
/assets/2x/default_achievements.png -- 3.68kb -> 2.08kb (43.46%)
/assets/1x/default_achievements.png -- 2.87kb -> 1.65kb (42.57%)
/libs/nativefs/icon.png -- 138.47kb -> 91.52kb (33.91%)

Signed-off-by: ImgBotApp <ImgBotHelp@gmail.com>

Author: ImgBotApp