Revert: Remove 'group' attribute from macros

The 'group' attribute is not supported in all Klipper versions.
This caused: 'Option group is not valid in section gcode_macro'

Macros will appear under 'Uncategorized' in Mainsail/Fluidd
until Klipper adds official support for macro grouping.

optimized_user_settings.cfg

@@ -79,7 +79,6 @@ runout_gcode:
 # ============================================================================
 
 [gcode_macro PRINT_START]
-group: Printing
 gcode:
     #--- Setup & Reset ---
     M117 Setting up parameters...
@@ -134,7 +133,6 @@ gcode:
 # ============================================================================
 
 [gcode_macro PRINT_END]
-group: Printing
 gcode:
     M117 Finishing print...
     RESPOND MSG="Print completed! Finishing up..."
@@ -165,7 +163,6 @@ gcode:
 
 [gcode_macro QUICK_TOUCH]
 description: Quick Z measurement with Cartographer
-group: Calibration
 gcode:
     {% if printer.toolhead.homed_axes != "xyz" %}
         G28
@@ -175,7 +172,6 @@ gcode:
 
 [gcode_macro CALIBRATE_PROBE]
 description: Manual Z-offset calibration
-group: Calibration
 gcode:
     {% if printer.toolhead.homed_axes != "xyz" %}
         G28
@@ -184,12 +180,10 @@ gcode:
     CARTOGRAPHER_CALIBRATE
 
 [gcode_macro BABYZ_PLUS]
-group: Helpers
 gcode:
     SET_GCODE_OFFSET Z_ADJUST=0.005 MOVE=1
 
 [gcode_macro BABYZ_MINUS]
-group: Helpers
 gcode:
     SET_GCODE_OFFSET Z_ADJUST=-0.005 MOVE=1