Remove undefined function

No change in memory footprint.

Firmware/mesh_bed_leveling.h

@@ -24,11 +24,6 @@ public:
     static float get_x(int i) { return float(MESH_MIN_X) + float(MESH_X_DIST) * float(i); }
     static float get_y(int i) { return float(MESH_MIN_Y) + float(MESH_Y_DIST) * float(i); }
     
-    // Measurement point for the Z probe.
-    // If use_default=true, then the default positions for a correctly built printer are used.
-    // Otherwise a correction matrix is pulled from the EEPROM if available.
-    static void get_meas_xy(int ix, int iy, float &x, float &y, bool use_default);
-    
     void set_z(uint8_t ix, uint8_t iy, float z) { z_values[iy][ix] = z; }
     
     int select_x_index(float x) {