Add extra braces for trackball keymaps (#16361)

keyboards/handwired/aball/keymaps/default/keymap.c

@@ -16,4 +16,4 @@
 #include QMK_KEYBOARD_H
 
 // Dummy
-const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {{ KC_NO }};
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {{{ KC_NO }}};

keyboards/ploopyco/trackball_nano/keymaps/default/keymap.c

@@ -21,4 +21,4 @@
 // safe range starts at `PLOOPY_SAFE_RANGE` instead.
 
 // Dummy
-const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {{ KC_NO }};
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {{{ KC_NO }}};

keyboards/ploopyco/trackball_nano/keymaps/maddie/keymap.c

@@ -25,7 +25,7 @@ int8_t  delta_x        = 0;
 int8_t  delta_y        = 0;
 
 // Dummy
-const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {{ KC_NO }};
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {{{ KC_NO }}};
 
 void process_mouse_user(report_mouse_t *mouse_report, int8_t x, int8_t y) {
     if (scroll_enabled) {