Shortcut Helper - UI - Right align shortcut commands

+ Tweak a few paddings and dimensions to match spec

Test: Manual
Test: ShortcutHelperScreenshotTest
Fixes: 352257115
Flag: com.android.systemui.keyboard_shortcut_helper_rewrite
Change-Id: Ic3f9c6424e3da0cb01a2adcb4afbc1094a02ca30