PIP: Always enable rounded corners

Bug: 187922869

Previously, we turned on rounded corners with a sysprop in
bf309e63d4deaca7b0946913ea18438f3bfee6d8. Now that a bug in rendering
them in landscape has been fixed, remove the sysprop and always use
the rounded corners radius specified in the xml file.

Change-Id: Ib0f61bbcbee6ead82beec2b149b0892836492b78
3 files changed