Update specs for the resizable widget frame

This change removes the padding between the widget and the outline. It
also updates the stroke width and corner radius of the outline.

Test: atest ResizeableItemFrameScreenshotTest
Test: visual; see recordings in bug
Bug: 419357983
Flag: com.android.systemui.hub_edit_mode_transition
Change-Id: Ifd7a9dbc4b5ccb0b0b68bbc57ac30e28873c74cd