Fix: Configure ADXL345 as integrated Cartographer component

The ADXL345 accelerometer is built into the Cartographer probe.
It must be configured within the [cartographer] section, not as
a separate [adxl345] device.

Changes:
- Added 'accel_chip: adxl345' to [cartographer] section
- Removed separate [adxl345] section (no longer needed)
- Changed [resonance_tester] to use 'accel_chip: cartographer'
- Added default probe_points for resonance testing

This fixes: 'Invalid adxl345 id (got 0 vs e5)' error

Reference: https://docs.cartographer3d.com/

optimized_user_settings.cfg

@@ -24,6 +24,7 @@ mcu: cartographer
 x_offset: 0
 y_offset: 22
 verbose: no
+accel_chip: adxl345
 
 [bed_mesh]
 zero_reference_position: 165, 165
@@ -41,13 +42,11 @@ sensor_mcu: cartographer
 min_temp: 5
 max_temp: 105
 
-[adxl345]
-cs_pin: cartographer:PA3
-spi_bus: spi1
+# ADXL345 is integrated in Cartographer - configured via accel_chip in [cartographer] section
 
 [resonance_tester]
-accel_chip: adxl345
-probe_points:
+accel_chip: cartographer
+probe_points: 165, 165, 20
     165, 165, 20
 
 # ============================================================================

user_settings_clean.cfg

@@ -24,6 +24,7 @@ mcu: cartographer
 x_offset: 0
 y_offset: 22
 verbose: no
+accel_chip: adxl345
 
 [bed_mesh]
 zero_reference_position: 165, 165
@@ -41,13 +42,11 @@ sensor_mcu: cartographer
 min_temp: 5
 max_temp: 105
 
-[adxl345]
-cs_pin: cartographer:PA3
-spi_bus: spi1
+# ADXL345 is integrated in Cartographer - configured via accel_chip in [cartographer] section
 
 [resonance_tester]
-accel_chip: adxl345
-probe_points:
+accel_chip: cartographer
+probe_points: 165, 165, 20
     165, 165, 20
 
 # ============================================================================