updated expected exception from a bad module load

Author: Brent Cook

spec/lib/rex/post/meterpreter/client_core_spec.rb

@@ -43,7 +43,7 @@
     context 'with a missing a module' do
       let(:mod) {"eaten_by_av"}
       it 'should be available' do
-        expect { client_core.use(mod) }.to raise_error(TypeError)
+        expect { client_core.use(mod) }.to raise_error(RuntimeError)
       end
     end