fix: correct displaying progress bar on Android

[lukewalczak]

Summary

Nested ProgressBar sometimes has some issues with displaying properly the progress on the ProgressBar, because initial width is zero, then it's updated to the real value, however the component does not update itself. Making it conditionally fixes the problem.

On the screenshots you can observe:

• left column presents fixed nested progress bar from the issue
• right column presents all progressbar examples, to show that nothing breaks

fixed	default progress bar examples

Test plan

• Run the example app, open the ProgressBar and observe all the cases are working properly.

[github-actions]

The mobile version of example app from this branch is ready! You can see it here

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[p-syche]

Small change to fix a big problem, nice!