fix:calcute the left_center_pt and right_center_pt from min_area_quad (#14363)

Author: fangfangzk

ppocr/data/imaug/pg_process.py

@@ -265,8 +265,8 @@ def fit_and_gather_tcl_points_v2(
         ys, xs = np.where(tmp_image > 0)
         xy_text = np.array(list(zip(xs, ys)), dtype="float32")
 
-        left_center_pt = ((min_area_quad[0] - min_area_quad[1]) / 2.0).reshape(1, 2)
-        right_center_pt = ((min_area_quad[1] - min_area_quad[2]) / 2.0).reshape(1, 2)
+        left_center_pt = ((min_area_quad[0] + min_area_quad[3]) / 2.0).reshape(1, 2)
+        right_center_pt = ((min_area_quad[1] + min_area_quad[2]) / 2.0).reshape(1, 2)
         proj_unit_vec = (right_center_pt - left_center_pt) / (
             np.linalg.norm(right_center_pt - left_center_pt) + 1e-6
         )