Limit preview width to the max chooser width value.

This is just a straightforward fix, b/235278644 to clean up the logic.
Fix: 223775954
Test: Manual test - share a long link on a phone in landscape
orientation with 3-button system navigation.

Change-Id: I051c5d0ba7216e6a43f2e56c9e2b6af16cd8a3fc