fix(player): Fix scaleX being NaN on minimize to background app switch

This aims to fix the following Exception which might occour when watching a live stream and switching the app while 'minimize to backgorund' is enabled:

java.lang.IllegalArgumentException: Cannot set 'scaleX' to Float.NaN
	at android.view.View.sanitizeFloatPropertyValue(View.java:17479)
	at android.view.View.sanitizeFloatPropertyValue(View.java:17453)
	at android.view.View.setScaleX(View.java:16822)
	at org.schabi.newpipe.views.ExpandableSurfaceView.onLayout(ExpandableSurfaceView.java:71)

scaleX is set in onMeasure() in which width could be 0 in theory and this leading to a division by zero of a float which results in an assignment of Float.NaN.

Author: TobiGr

app/src/main/java/org/schabi/newpipe/views/ExpandableSurfaceView.java

@@ -35,12 +35,12 @@ protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec
                 && resizeMode != RESIZE_MODE_FIT
                 && verticalVideo ? maxHeight : baseHeight;
 
-        if (height == 0) {
+        if (width == 0 || height == 0) {
             return;
         }
 
         final float viewAspectRatio = width / ((float) height);
-        final float aspectDeformation = videoAspectRatio / viewAspectRatio - 1;
+        final float aspectDeformation = (videoAspectRatio / viewAspectRatio) - 1;
         scaleX = 1.0f;
         scaleY = 1.0f;