Remove :r shortcut command

Removing this excessive shortcut command as it clutters the drop down
slash commands. This shortcut technically already happens now when you
start typing /roll

dice_maiden.rb

@@ -39,10 +39,6 @@
   @bot.register_application_command(:roll, 'Ask Dice Maiden to roll some dice!') do |cmd|
     cmd.string('message', 'roll syntax sent to Dice Maiden. Type help or visit github to view possible commands', required: true)
   end
-
-  @bot.register_application_command(:r, 'Ask Dice Maiden to roll some dice!') do |cmd|
-    cmd.string('message', 'roll syntax sent to Dice Maiden. Type help or visit github to view possible commands', required: true)
-  end
 end
 
 inc_cmd = lambda do |event|
@@ -174,7 +170,6 @@
 end
 
 @bot.application_command(:roll, &inc_cmd)
-@bot.application_command(:r, &inc_cmd)
 
 if @launch_option == 'lite'
   @bot.run