Environment

• CLI: rc
• Cross-platform modules: rc
• Android Runtime: rc

Describe the bug
The TabStripItem selected / highlight indicator is not visible in case TabStripItem background color is set.

To Reproduce
Use the following setup (also visible in e2e/ui-tests-app -> tabs -> background-color example):

<Tabs>
  <TabStrip>
      <TabStripItem title="First" class="special"></TabStripItem>
      <TabStripItem title="Second"></TabStripItem>
  </TabStrip>

  <TabContentItem class="special">
      <GridLayout>
        <Label text="First View" />
      </GridLayout>
  </TabContentItem>

  <TabContentItem>
      <GridLayout>
        <Label text="Second View" />
      </GridLayout>
  </TabContentItem>
</Tabs>

TabStripItem.special {
  background-color: teal;
}

TabStripItem.special:active {
  background-color: yellowgreen;
}

Expected behavior
Highlight indicator should be visible if tabstripitem is selected no matter whether any css is applied.

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