fix(FEC-11510): No default font size selected in cvaa (#639)

Use fontSize instead of fontScale.
Fixes FEC-11510.

Related PRs:
kaltura/playkit-js#603
kaltura/kaltura-player-js#491

src/components/cvaa-overlay/custom-captions-window.js

@@ -61,10 +61,10 @@ class CustomCaptionsWindow extends Component {
     const edgeStyles = player.TextStyle.EdgeStyles;
     const standardColors = player.TextStyle.StandardColors;
 
-    const fontScaleOptions = player.TextStyle.FontSizes.map(scale => ({
-      value: scale.value,
-      label: scale.label,
-      active: props.customTextStyle.fontScale === scale.value
+    const fontSizeOptions = player.TextStyle.FontSizes.map(size => ({
+      value: size.label,
+      label: size.label,
+      active: props.customTextStyle.fontSize === size.label
     }));
 
     const fontColorOptions = Object.keys(standardColors).map(key => ({
@@ -97,9 +97,9 @@ class CustomCaptionsWindow extends Component {
           <DropDownCaptionsStyle
             addAccessibleChild={props.addAccessibleChild}
             labelId="cvaa.size_label"
-            options={fontScaleOptions}
+            options={fontSizeOptions}
             classNames={[style.formGroupRow, style.fontSize]}
-            styleName="fontScale"
+            styleName="fontSize"
             changeCustomStyle={props.changeCustomStyle}
           />
           <DropDownCaptionsStyle