Updating the paddings in folder cell

> Updating overall padding for the cell and adding drawable padding
> Ensuring that the folder cell is always rendered properly based
  on available vertical space

Bug: 30605958
Change-Id: I8ceb9fea5a25052b0d7461f52edca0e6a33fa085

src/com/android/launcher3/Utilities.java

@@ -686,11 +686,11 @@ public final class Utilities {
     /**
      * Calculates the height of a given string at a specific text size.
      */
-    public static float calculateTextHeight(float textSizePx) {
+    public static int calculateTextHeight(float textSizePx) {
         Paint p = new Paint();
         p.setTextSize(textSizePx);
         Paint.FontMetrics fm = p.getFontMetrics();
-        return -fm.top + fm.bottom;
+        return (int) Math.ceil(fm.bottom - fm.top);
     }
 
     /**