Base: Add PixelPaint (*.pp) file type icons

Author: https://github.com/jackburnergithub 🔰
Commit: 4175be6960
Pull-request: https://github.com/SerenityOS/serenity/pull/9883
Reviewed-by: https://github.com/linusg ✅

Base/etc/FileIconProvider.ini

@@ -18,3 +18,4 @@ sound=*.wav,*.flac
 spreadsheet=*.sheets,*.csv
 text=*.txt
 truetype=*.ttf
+pixelpaint=*.pp