Fix: Remove duplicate 'bad omen' alias from raid_omen potion effect

[LalitNarayanYadav]

Problem

The all potion effect types list currently includes "bad omen" twice and does not correctly distinguish between "bad omen" and the newer "raid omen" effect. This happens because raid_omen is aliased as both "bad omen" and "raid omen" in default.lang. As a result, scripts referencing potion effects may encounter duplicate or unintended entries.

Solution

This pull request updates the default.lang file to remove "bad omen" as an alias for raid_omen. With this change, raid_omen will only respond to "raid omen", preventing duplication and aligning the aliases more accurately with Minecraft version 1.21+ behavior.

Testing Completed

• Used a test Skript command:

  command /test:
      trigger:
          set {_effects::*} to all potion effect types
          loop {_effects::*}:
              if loop-value is bad omen or raid omen:
                  add loop-value to {_output::*}
          send "%{_output::*}%"
  
  

Completes: #7916

Related: none