Remove unnecessary thread cleaning from Msf::Framework spec

MSP-11605

Author: limhoff-r7

spec/lib/msf/core/framework_spec.rb

@@ -4,8 +4,6 @@
 require 'msf/core/framework'
 
 describe Msf::Framework do
-  include_context 'Msf::Framework#threads cleaner'
-
   context '#initialize' do
     subject(:framework) {
       described_class.new