Update spec with new intended cmd_creds behavior

Creds behavior was changed in PR #11742

spec/lib/msf/ui/console/command_dispatcher/creds_spec.rb

@@ -79,9 +79,9 @@ RSpec.describe Msf::Ui::Console::CommandDispatcher::Creds do
             ])
           end
 
-          it 'should match a regular expression' do
+          it 'should not match a regular expression' do
             creds.cmd_creds('-u', "^#{username}$")
-            expect(@output).to eq([
+            expect(@output).to_not eq([
               'Credentials',
               '===========',
               '',
@@ -91,17 +91,6 @@ RSpec.describe Msf::Ui::Console::CommandDispatcher::Creds do
             ])
           end
 
-          it 'should return nothing for a non-matching regular expression' do
-            creds.cmd_creds('-u', "^#{nomatch_username}$")
-            expect(@output).to eq([
-              'Credentials',
-              '===========',
-              '',
-              'host  origin  service  public  private  realm  private_type  JtR Format',
-              '----  ------  -------  ------  -------  -----  ------------  ----------'
-            ])
-          end
-
           context 'and when the username is blank' do
             it 'should show a user that matches the given expression' do
               creds.cmd_creds('-u', blank_username)