Make sure fail case is correct

`rand(1000)` would return 0 one in a thousand times, causing this test to
randomly fail at that interval

spec/support/shared/examples/lib/metasploit/framework/login_scanner/login_scanner_base.rb

@@ -84,7 +84,7 @@ shared_examples_for 'Metasploit::Framework::LoginScanner::Base' do
       end
 
       it 'is not valid for a number greater than 65535' do
-        login_scanner.port = rand(1000) + 65535
+        login_scanner.port = 65536
         expect(login_scanner).to_not be_valid
         expect(login_scanner.errors[:port]).to include "must be less than or equal to 65535"
       end
@@ -332,4 +332,4 @@ shared_examples_for 'Metasploit::Framework::LoginScanner::Base' do
     end
 
   end
-end
+end