Fix T84964: Crash when running Knife Project in the background

Although the Knife Project operator converts 3D coordinates to screen
space, it doesn't really need opengl.

Differential Revision: https://developer.blender.org/D10178

source/blender/editors/mesh/editmesh_knife.c

@@ -3067,8 +3067,6 @@ void EDBM_mesh_knife(bContext *C, LinkNode *polys, bool use_tag, bool cut_throug
 {
   KnifeTool_OpData *kcd;
 
-  view3d_operator_needs_opengl(C);
-
   /* init */
   {
     const bool only_select = false;