refactor: use OPTIONS_PER_ROLE where needed

In some part of the code, we have the `OPTIONS_PER_ROLE` value hardcoded
as in

    return frequencyMap.values().stream().filter(value -> value != 3).count();

Replace the hardcoded 3 with the actual constant we have previously made
so that it mirrors any potential changes we make in the future regarding
this value (perhaps we decide to remove emojis as arguments and suddenly
we find ourselves in a situation where the `OPTIONS_PER_ROLE` constant
is now 2.

Suggested-by: Zabuzard <zabuza.dev@gmail.com>
Signed-off-by: Chris Sdogkos <work@chris-sdogkos.com>

Author: christolis

application/src/main/java/org/togetherjava/tjbot/features/roleapplication/CreateRoleApplicationCommand.java

@@ -193,7 +193,7 @@ private static long getIncorrectRoleArgsCount(final List<OptionMapping> args) {
             .map(name -> name.split(OPTION_PARAM_ID_DELIMITER)[1])
             .forEach(number -> frequencyMap.merge(number, 1, Integer::sum));
 
-        return frequencyMap.values().stream().filter(value -> value != 3).count();
+        return frequencyMap.values().stream().filter(value -> value != OPTIONS_PER_ROLE).count();
     }
 
     /**