Fix settings gear visibility

When the settings gear is first initialized the width can be reported as
0, which lead to NaN in the `map` function and throwing off the other
calculations. This adds a check to the width so it will simply be set
invisible in that case instead

Fixes: 185929062
Test: manual (repro steps in bug)

Change-Id: Id2a8582e8342d807825536bfcaac7d79a042c7cc