Fix legacy nametag color customisation #6189
Merged
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Previously, the Nametag inputs in the Theme tab in the Admin Panel did not do anything. This fix ensures this legacy method of changing nametags works. Alternatively, "nametag-color" and "nametag-text-color" can be added to the theme variables and will also update nametags.
Additionally, we now disable the save button if there is a warning message currently issued for an invalid input.