Remove unnecessary HERMES_V1_ENABLED=1 inside build.gradle

[cortinico]

Summary:

This is no longer necessary and just creates a warning:

C/C++: CMake Warning:
C/C++:   Manually-specified variables were not used by the project:
C/C++:     HERMES_V1_ENABLED

Let's clean this up.

Changelog:

[INTERNAL] -

Test Plan:

CI

[meta-codesync]

@cortinico has imported this pull request. If you are a Meta employee, you can view this in D105946805.

[meta-codesync]

@cortinico merged this pull request in 5c937d7.

[react-native-bot]

This pull request was successfully merged by @cortinico in 5c937d7

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