[FEATURE] Force black text when charging/low power mode

[Pomi108]

I just wanna preface this by saying I love this tweak! But no matter what I do, the percentage text always seems to be transparent, even when set to "Default" – which doesn't mesh well at all with light backgrounds. It would be great to have a feature that would automatically change the text to be black (or a customisable colour) when charging/LPM.