Fix conflicting extern/inline declarations

The functions find_bed_induction_sensor_point_* have conflicting
extern and inline declarations.

These are used outside of the compilation unit only, and thus there's no
point in defining them inline.

This causes a compilation failure at O1 and above, which is strangely
avoided at Os.

Firmware/mesh_bed_calibration.cpp

@@ -944,7 +944,7 @@ static inline void update_current_position_z()
 
 // At the current position, find the Z stop.
 
-inline bool find_bed_induction_sensor_point_z(float minimum_z, uint8_t n_iter, int
+bool find_bed_induction_sensor_point_z(float minimum_z, uint8_t n_iter, int
 #ifdef SUPPORT_VERBOSITY
     verbosity_level
 #endif //SUPPORT_VERBOSITY
@@ -1065,7 +1065,7 @@ error:
 }
 
 #ifdef NEW_XYZCAL
-extern bool xyzcal_find_bed_induction_sensor_point_xy();
+bool xyzcal_find_bed_induction_sensor_point_xy();
 #endif //NEW_XYZCAL
 // Search around the current_position[X,Y],
 // look for the induction sensor response.
@@ -1081,7 +1081,7 @@ extern bool xyzcal_find_bed_induction_sensor_point_xy();
 #endif //HEATBED_V2
 
 #ifdef HEATBED_V2
-inline bool find_bed_induction_sensor_point_xy(int
+bool find_bed_induction_sensor_point_xy(int
 #if !defined (NEW_XYZCAL) && defined (SUPPORT_VERBOSITY)
         verbosity_level
 #endif
@@ -1335,7 +1335,7 @@ inline bool find_bed_induction_sensor_point_xy(int
 #endif //NEW_XYZCAL
 }
 #else //HEATBED_V2
-inline bool find_bed_induction_sensor_point_xy(int verbosity_level)
+bool find_bed_induction_sensor_point_xy(int verbosity_level)
 {
 #ifdef NEW_XYZCAL
 	return xyzcal_find_bed_induction_sensor_point_xy();

Firmware/mesh_bed_calibration.h

@@ -146,9 +146,9 @@ inline bool world2machine_clamp(float &x, float &y)
     return clamped;
 }
 
-extern bool find_bed_induction_sensor_point_z(float minimum_z = -10.f, uint8_t n_iter = 3, int verbosity_level = 0);
-extern bool find_bed_induction_sensor_point_xy(int verbosity_level = 0);
-extern void go_home_with_z_lift();
+bool find_bed_induction_sensor_point_z(float minimum_z = -10.f, uint8_t n_iter = 3, int verbosity_level = 0);
+bool find_bed_induction_sensor_point_xy(int verbosity_level = 0);
+void go_home_with_z_lift();
 
 /**
  * @brief Bed skew and offest detection result