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

packages/SystemUI/src/com/android/systemui/media/MediaCarouselScrollHandler.kt

@@ -236,7 +236,7 @@ class MediaCarouselScrollHandler(
     }
 
     private fun updateSettingsPresentation() {
-        if (showsSettingsButton) {
+        if (showsSettingsButton && settingsButton.width > 0) {
             val settingsOffset = MathUtils.map(
                     0.0f,
                     getMaxTranslation().toFloat(),