Blender Git Loki

UV: tweak island select behavior

Selecting inside an island no longer de-selects
when it's too far from an edge.

When edge select fails fall back to inside-face test.

This follows 908b383b7d2199c0c614d085ff65a03eb7852274
which made this change for face-select.

Apply to island selection since it doesn't make sense
for island select to behave differently.