[Keyboard] change RGBLED_NUM to 20 for zoom87 (#18930)

Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/meletrix/zoom87/config.h

@@ -35,7 +35,7 @@
 
 #define RGB_DI_PIN D2
 #ifdef RGB_DI_PIN
-    #define RGBLED_NUM 10
+    #define RGBLED_NUM 20
     #define RGBLIGHT_HUE_STEP 8
     #define RGBLIGHT_SAT_STEP 8
     #define RGBLIGHT_VAL_STEP 8

keyboards/meletrix/zoom87/readme.md

@@ -1,5 +1,7 @@
 # zoom87
 
+![Zoom87](https://i.imgur.com/BfoEUQBh.jpeg)
+
 More Info at [meletrix](https://meletrix.com/)
 ​