UI: Remove duplicate Mark/Clear Seam entries from Edge menus

These already exist in the UV menu (both in the 3D Viewport and UV Editor)
which makes it more clear that this feature is related to UV Unwrapping.

release/scripts/startup/bl_ui/space_view3d.py

@@ -3762,11 +3762,6 @@ class VIEW3D_MT_edit_mesh_context_menu(Menu):
 
             col.separator()
 
-            col.operator("mesh.mark_seam").clear = False
-            col.operator("mesh.mark_seam", text="Clear Seam").clear = True
-
-            col.separator()
-
             col.operator("mesh.mark_sharp")
             col.operator("mesh.mark_sharp", text="Clear Sharp").clear = True
 
@@ -4012,11 +4007,6 @@ class VIEW3D_MT_edit_mesh_edges(Menu):
 
         layout.separator()
 
-        layout.operator("mesh.mark_seam").clear = False
-        layout.operator("mesh.mark_seam", text="Clear Seam").clear = True
-
-        layout.separator()
-
         layout.operator("mesh.mark_sharp")
         layout.operator("mesh.mark_sharp", text="Clear Sharp").clear = True