GPencil: Cleanup unused lines

These lines were related to other brushes and were copied in the function by error, but not required.

source/blender/editors/gpencil/gpencil_brush.c

@@ -894,7 +894,6 @@ static bool gp_brush_weight_apply(
   /* create dvert */
   BKE_gpencil_dvert_ensure(gps);
 
-  bGPDspoint *pt = gps->points + pt_index;
   MDeformVert *dvert = gps->dvert + pt_index;
   float inf;
 
@@ -939,11 +938,6 @@ static bool gp_brush_weight_apply(
     dw->weight = curweight;
   }
 
-  /* weight should stay within [0.0, 1.0] */
-  if (pt->pressure < 0.0f) {
-    pt->pressure = 0.0f;
-  }
-
   return true;
 }