Fix shortcut size calcuation

Shortcut size should be the size of all apps icon + padding

Test: Check shortcuts and widgets are shown without crash in the
      following surfaces with display & font set to largest and
      display cutout enabled. Repeat the same test with normal
      display setting and no cutout.
      1. Full widgets picker
      2. Bottom widgets picker
      3. Pin widget dialog
Fix: 193422438
Change-Id: Ibfebf94e92eed5e9cd1dd4196d98823b0e4dda6b