[2.0.x] Relative movements fix (#9259)

Marlin/src/gcode/gcode.cpp

@@ -94,8 +94,10 @@ bool GcodeSuite::get_target_extruder_from_command() {
 void GcodeSuite::get_destination_from_command() {
   LOOP_XYZE(i) {
     if (parser.seen(axis_codes[i])) {
-      const float v = parser.value_axis_units((AxisEnum)i) + (axis_relative_modes[i] || relative_mode ? current_position[i] : 0);
-      destination[i] = i == E_AXIS ? v : LOGICAL_TO_NATIVE(v, i);
+      const float v = parser.value_axis_units((AxisEnum)i);
+      destination[i] = (axis_relative_modes[i] || relative_mode)
+        ? current_position[i] + v
+        : (i == E_AXIS) ? v : LOGICAL_TO_NATIVE(v, i);
     }
     else
       destination[i] = current_position[i];