refactor: Remove unimportant labels

Removed "label" properties which no longer have any function.

Labels are still used as layer names and as identifiers for sending
behaviors between sides of a split keyboard, so those have been left
alone for now.

app/boards/shields/microdox/microdox.dtsi

@@ -9,7 +9,6 @@
 / {
     kscan0: kscan {
         compatible = "zmk,kscan-gpio-matrix";
-        label = "KSCAN";
         diode-direction = "col2row";
         row-gpios
             = <&pro_micro 16 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>