fix: skip camera permission if disable instant camera is true

[waifucon]

Description

Hi, It is annoying for the user, if the user have Disable Instant Camera enabled, and it asks the user to grant camera permission for just opening the gallery.

This is merged in Nullgram: qwq233/Nullgram#394

Check List

• I have tested the changes and verified that they work and don't break anything(as well as I can manage) or drop the support for previous versions.
• My code follows the code style of this project
• I have merged commits that are meaningless for follow-up work and confirmed that they will not cause damage to follow-up maintenance

[NextAlone]

Merged into main as 161ffed. Thanks!

The implementation differs slightly from this PR: instead of forcing the request argument of checkCamera to false at the two call sites, only the requestPermissions branch inside checkCamera is gated with !Config.disableInstantCamera. With request=false, users who already granted the camera permission but have no cameraCache yet would also skip initCamera; gating just the prompt keeps that path unchanged.