Fix acceptance tests prompt matching

Author: sjanusz-r7

spec/lib/msf/ui/text/dispatcher_shell_spec.rb

@@ -2,7 +2,7 @@
 require 'readline'
 
 RSpec.describe Rex::Ui::Text::DispatcherShell do
-  let(:prompt) { '%undmsf6%clr' }
+  let(:prompt) { '%undmsf%clr' }
   let(:prompt_char) { '%clr>' }
   let(:subject) do
     dummy_class = Class.new

spec/support/acceptance/child_process.rb

@@ -541,7 +541,7 @@ def initialize
     end
 
     def self.prompt
-      /msf6.*>\s+/
+      /msf.*>\s+/
     end
 
     def reset