Don't force ALL CAPS for the fenix snackbar action button text
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### 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
This is the text in question
{width=25%}
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