[native] disable forceDarkAllowed on android

Summary:
https://linear.app/comm/issue/ENG-1835/inline-code-in-messages-is-unreadable-on-android-with-a-forced-dark
Disables forceDarkAllowed option because markdown inline code would display incorrectly.

Test Plan: Check if inline code displays correctly. Check if there are any unexpected changes in the rest of the app.

Reviewers: tomek, atul, abosh, ashoat

Reviewed By: ashoat

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D5192