[0.80] Remove folly flags from template

[mrousavy]

Target Branch

0.80

Link to commit or PR to be picked

react-native-community/template#154

Description

This PR removes the unneeded folly flags for the iOS app template for RN 0.80.

Also, these folly flags would need to be removed for each library to fix a weird SIGABRT due to memory issues - probably because folly headers doesn't match the precompiled implementation after building.

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[mrousavy]

nvm react-native-community/template#154 (comment).