Fix DAC-related bugs (#19921)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

Marlin/src/feature/dac/dac_mcp4728.cpp

  * DAC Values array and calls fastwrite to update the DAC.
  */
 void MCP4728::setDrvPct(xyze_uint8_t &pct) {
-  dac_values *= 0.01 * pct * (DAC_STEPPER_MAX);
+  dac_values *= pct.asFloat() * 0.01f * (DAC_STEPPER_MAX);
   fastWrite();
 }
 

Marlin/src/gcode/calibrate/G34.cpp

     const uint16_t target_current = parser.intval('S', GANTRY_CALIBRATION_CURRENT);
     const uint32_t previous_current = stepper.motor_current_setting[Z_AXIS];
     stepper.set_digipot_current(1, target_current);
-  #elif HAS_MOTOR_CURRENT_DAC
+  #elif ENABLED(HAS_MOTOR_CURRENT_DAC)
     const float target_current = parser.floatval('S', GANTRY_CALIBRATION_CURRENT);
     const float previous_current = dac_amps(Z_AXIS, target_current);
     stepper_dac.set_current_value(Z_AXIS, target_current);
     stepper.set_digipot_current(Z_AXIS, previous_current);
   #elif HAS_MOTOR_CURRENT_PWM
     stepper.set_digipot_current(1, previous_current);
-  #elif HAS_MOTOR_CURRENT_DAC
+  #elif ENABLED(HAS_MOTOR_CURRENT_DAC)
     stepper_dac.set_current_value(Z_AXIS, previous_current);
   #elif ENABLED(HAS_MOTOR_CURRENT_I2C)
     digipot_i2c.set_current(Z_AXIS, previous_current)

Marlin/src/lcd/menu/menu_advanced.cpp

     EDIT_DAC_PERCENT(Y);
     EDIT_DAC_PERCENT(Z);
     EDIT_DAC_PERCENT(E);
-    ACTION_ITEM(MSG_DAC_EEPROM_WRITE, dac_commit_eeprom);
+    ACTION_ITEM(MSG_DAC_EEPROM_WRITE, stepper_dac.commit_eeprom);
     END_MENU();
   }
 

Marlin/src/module/settings.cpp

     #elif HAS_MOTOR_CURRENT_I2C                                // i2c-based has any number of values
       // Values sent over i2c are not stored.
       // Indexes map directly to drivers, not axes.
-    #elif HAS_MOTOR_CURRENT_DAC                                // DAC-based has 4 values, for X Y Z E
+    #elif ENABLED(HAS_MOTOR_CURRENT_DAC)                                // DAC-based has 4 values, for X Y Z E
       // Values sent over i2c are not stored. Uses indirect mapping.
     #endif