Revert "[RN][iOS] Make universal builds"
Revert "[RN][iOS] Make universal builds"

This reverts commit b96ca538e47f37baa70e0e7f59babcce561cfc5d. While iPad
support is nice to have, we are not ready for a publish in App Store.
During the upload to iTunes Connect, a verification of the .ipa fails
because:

- app icons for iPad are missing:
  - 76x76 pixels in .png format for iOS versions >= 7.0,
  - 167x167 pixels in .png format for iOS versions supporting iPad Pro,
  - 152x152 pixels in .png format for iOS versions >= 7.0,
- orientations required for iPad Mutitasking are missing:
  - UIInterfaceOrientationPortraitUpsideDown.

jitsi/jitsi-meet,gpolitis/jitsi-meet,bgrozev/jitsi-meet,jitsi/jitsi-meet,gpolitis/jitsi-meet,jitsi/jitsi-meet,jitsi/jitsi-meet,gpolitis/jitsi-meet,jitsi/jitsi-meet,gpolitis/jitsi-meet,gpolitis/jitsi-meet,gpolitis/jitsi-meet,jitsi/jitsi-meet,bgrozev/jitsi-meet,gpolitis/jitsi-meet,bgrozev/jitsi-meet,bgrozev/jitsi-meet,bgrozev/jitsi-meet,gpolitis/jitsi-meet,jitsi/jitsi-meet,bgrozev/jitsi-meet,jitsi/jitsi-meet