Adds a default value for IS_COMMAND for COMMAND feature (#4301)

* Add default value for IS_COMMAND for COMMAND feature

* Cleanup and consistency

* Update Templates to reflect change

* Fix IS_COMMAND in template

* Fix IS_COMMAND define

* Use consistent IS_COMMAND block in templates

* Remove unnecessary `#undef IS_COMMAND` directives

* Fix compile issue on orthodox

* Reomve IS_COMMAND option for newer boards

* Remove all existing definitions of IS_COMMAND if they use default LSHIFT and RSHIFT setting

* Remove a couple of additional IS_COMMAND defines

* Remove remaining redundant IS_COMMAND definitions

* Remove #undef IS_COMMAND from orthodox:drashna and whitefox:konstantin

* Remove multiple empty lines in modified config.h files

* Update additional boards

* Reomve IS_COMMAND from newer boards

* Update Alice keyboard

* Remove IS_COMMAND from additional boards

Jan 24th edition

keyboards/40percentclub/4x4/config.h

@@ -30,7 +30,6 @@
 #define MATRIX_COL_PINS { C6, D7, E6, B4, B5, B6, B7, D6, F7, F6, F5, F4, F1, F0, B3, B1 }
 #define UNUSED_PINS
 
-
 /* COL2ROW, ROW2COL, or CUSTOM_MATRIX */
 #define DIODE_DIRECTION COL2ROW
 
@@ -38,7 +37,6 @@
 // #define BACKLIGHT_BREATHING
 // #define BACKLIGHT_LEVELS 3
 
-
 /* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
 #define DEBOUNCING_DELAY 5
 
@@ -90,11 +88,6 @@
  *
  */
 
-/* key combination for magic key command */
-#define IS_COMMAND() ( \
-    keyboard_report->mods == (MOD_BIT(KC_LSHIFT) | MOD_BIT(KC_RSHIFT)) \
-)
-
 /* control how magic key switches layers */
 //#define MAGIC_KEY_SWITCH_LAYER_WITH_FKEYS  true
 //#define MAGIC_KEY_SWITCH_LAYER_WITH_NKEYS  true
@@ -199,4 +192,3 @@
 #define LCD_E_PIN        1            //< pin  for Enable line
 #endif
 */
-