Remove setting of eventloop function

If the InProcessInteractiveShell version of `enable_gui` calls the parent function in eventloops.py, it initializes `kernel.eventloop`, whereas it should be `None` in the InProcessKernel. This triggers exceptions in the kernel's `entering_eventloop` function.

Author: rayosborn

ipykernel/inprocess/ipkernel.py

@@ -175,13 +175,10 @@ class InProcessInteractiveShell(ZMQInteractiveShell):
 
     def enable_gui(self, gui=None):
         """Enable GUI integration for the kernel."""
-        from ipykernel.eventloops import enable_gui
         if not gui:
             gui = self.kernel.gui
-        enable_gui(gui, kernel=self.kernel)
         self.active_eventloop = gui
 
-
     def enable_matplotlib(self, gui=None):
         """Enable matplotlib integration for the kernel."""
         if not gui: