Land rapid7#4071, Change be_false to be_falsey in exe_spec

Author: zeroSteiner

spec/lib/msf/util/exe_spec.rb

@@ -26,7 +26,7 @@
 
   describe '.is_eicar_corrupted?' do
     it 'returns false' do
-      expect(described_class.is_eicar_corrupted?).to be_false
+      expect(described_class.is_eicar_corrupted?).to be_falsey
     end
   end