Fix colours for some polybar modules

.config/polybar/modules.ini

@@ -591,7 +591,7 @@ label-mode-background = #e60053
 ;   %output%
 ; Default: %icon%  %name%
 label-focused = %index%
-label-focused-foreground = #ffffff
+label-focused-foreground = ${color.fg}
 label-focused-background = ${color.sbg}
 label-focused-underline = ${color.ac}
 label-focused-padding = 4
@@ -1051,7 +1051,7 @@ label-maxlen = 30
 ; Available tokens:
 ;   None
 label-empty =  Arch Linux
-label-empty-foreground = #707880
+label-empty-foreground = ${color.fg}
 
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