Fix lockups entering apps or games

[XK9274]

We've found this is caused by a weird config combination... where if a certain TZ is set in runtime, MainUI inherits it and it causes some loops/threads within MainUI to not break out (it gets stuck in a threaded loop which will never exit), so you get stuck at a "Loading" screen when entering Roms, or a complete freeze when entering Apps.

It could be a mismatch of TZ between MainUI and everything that runs "before" it.. IE: updater, customer/main etc. & The kernel will never know about the TZ as we can't insert it so early. This is speculation, the root cause i haven't found.

This is obvious when files are removed from the SD and the time/date of creation checked on a windows PC, the TZ metadata is sometimes bad.

This pr will:

• Remove runtime.sh environments knowledge of the timezone, therefore MainUI no longer knows about the TZ either.
• Pass cmd_to_run.sh the timezone for apps and games to be aware it's potentially changed, and to set theirs correctly
• Tell BLF script about the TZ manually, as keymon now no longer knows the TZ.

TZ is already set in update_networking.sh main function so no changes needed there for anything called as they will inherit this TZ from their parent.

Games and apps will inherit this from pushing it through cmd_to_run.sh

To verify this PR:

• Rename your .tmp_update/config directoy
• Drop in the attached tainted config dir: config.zip
• Open the search app with something in the search field
• Hard power down with the power button
• Power on & try and load an app or game -> freeze.

Add in the new runtime.sh from this PR and re-run the above steps, observe no freeze.

The TZ is still correctly passed to retroarch:

And any apps:

Aslong as they're a child of either update_networking or cmd_to_run.sh