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/boards/nice_nano.overlay

@@ -25,7 +25,6 @@
 
     led_strip: ws2812@0 {
         compatible = "worldsemi,ws2812-spi";
-        label = "WS2812";
 
         /* SPI */
         reg = <0>; /* ignored, but necessary for SPI bindings */

app/boards/shields/microdox/boards/nice_nano_v2.overlay

@@ -25,7 +25,6 @@
 
     led_strip: ws2812@0 {
         compatible = "worldsemi,ws2812-spi";
-        label = "WS2812";
 
         /* SPI */
         reg = <0>; /* ignored, but necessary for SPI bindings */

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)>

app/boards/shields/microdox/microdox_common.dtsi

@@ -38,7 +38,6 @@ RC(2,0) RC(2,1) RC(2,2) RC(2,3) RC(2,4)  RC(2,5) RC(2,6) RC(2,7) RC(2,8) RC(2,9)
     oled: ssd1306@3c {
         compatible = "solomon,ssd1306fb";
         reg = <0x3c>;
-        label = "DISPLAY";
         width = <128>;
         height = <32>;
         segment-offset = <0>;

app/boards/shields/microdox/microdox_v2.dtsi

@@ -9,7 +9,6 @@
 / {
     kscan0: kscan {
         compatible = "zmk,kscan-gpio-matrix";
-        label = "KSCAN";
         diode-direction = "col2row";
     };
 };