Fix "global name 'idaapi' is not defined" plugin bug

[joseph-hannon]

Issue When using the "Show CPU Context" option in uEmu plugin in IDA 7.2 I get the following error:

Traceback (most recent call last):
  File "C:/Program Files/IDA 7.2/plugins/uEmu.py", line 114, in activate
    self.action_handler.handle_menu_action(self.action_type)
  File "C:/Program Files/IDA 7.2/plugins/uEmu.py", line 1557, in handle_menu_action
    [x.handler() for x in self.MENU_ITEMS if x.action == action]
  File "C:/Program Files/IDA 7.2/plugins/uEmu.py", line 1754, in show_cpu_context
    self.cpuContextView.Create("uEmu CPU Context")
  File "C:/Program Files/IDA 7.2/plugins/uEmu.py", line 458, in Create
    class Hooks(idaapi.UI_Hooks):
NameError: global name 'idaapi' is not defined

Cause Since the script doesn't use import idaapi can't access members like idaapi.*, change to using them directly.

[alexhude]

this issue is already addressed in upcoming commit

[alexhude]

Fixed in #0fa6c62