Fix curve on Mentor Tile

[adityathakurxd]

The mentor tile is curved and could be made square or minor curve as are tiles on home screen.

Present Widget:

• [x] Reduce edge border.

[divyanshkul]

I'd like to work on this, you can assign this to me now, or after #52 is resolved.

[up4154]

53 and #54 should be merged to solve this issue

[adityathakurxd]

Thank you @divyanshkul. This was a minor fix and @up4154 's #54 fixes this so will close it now.