Respect rounded.xml size in ScreenDecorations

Suppose vendors will customize rounded.xml with corresponding
multiple radius path and size, ScreenDecorations should not resize it
by rounded_corner_radius in case jagged edges problem

Test: atest SystemUITests
Test: atest ScreenDecorationsTest
Bug: 145707162
Bug: 148912090
Change-Id: Ie33526214072ad324ca00a10074ad212dfbf4258