Don't force ALL CAPS for the fenix snackbar action button text

Summary

We should let localizers decide if they want the fenix snackbar action button text to be in ALL CAPS by simply changing the relevant string. Currently, in the fenix_snackbar.xml, there is a field (namely android:textAllCaps="true) set that forces the action button text to ALL CAPS (if available) with no option to disable it.

Relevant logs and/or screenshots

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