res: ic_launcher2: Actually convert the launcher icon into PNG format

Current launcher icon is actually a .jpg file renamed as .png. This is evident because
Android Studio fails the builds with an error and lint warns regarding same as well.

Use an online converter to convert the image and drop the gradle flag which is no
longer required

Signed-off-by: Aayush Gupta <theimpulson@e.email>
1 job for aayush_test in 3 minutes and 53 seconds (queued for 2 seconds)