vial: add qmk settings reset command

quantum/vial.c

@@ -179,6 +179,10 @@ void vial_handle_cmd(uint8_t *msg, uint8_t length) {
 
             break;
         }
+        case vial_qmk_settings_reset: {
+            qmk_settings_reset();
+            break;
+        }
     }
 }
 

quantum/vial.h

@@ -43,6 +43,7 @@ enum {
     vial_qmk_settings_query = 0x09,
     vial_qmk_settings_get = 0x0A,
     vial_qmk_settings_set = 0x0B,
+    vial_qmk_settings_reset = 0x0C,
 };
 
 /* Fake encoder position in keyboard matrix, can't use 255 as that is immediately rejected by IS_NOEVENT  */