firewall: Alias selection issues when same named Alias and Interface Group exist with underscore

[Monviech]

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Describe the bug

When creating an Interface Group, and an Alias, which both have the exact same name with underscore (e.g. TEST_GRP), the Alias will resolve incorrectly in a Firewall rule when selecting the Alias (to TEST_GRP net).

When a group or Alias does not contain an underscore (e.g. both named TEST), this does not seem to happen, though it might also be wrong.

To Reproduce

Steps to reproduce the behavior:

1. Go to 'Firewall->Groups' and create a new Group with the name "TEST_GRP"
2. Go to 'Firewall->Aliases' and create a new Alias, type "Host(s)", content "127.0.0.1", name "TEST_GRP"
3. Go to 'Firewall->Rules->TEST_GRP' and create a new rule with the Alias "TEST_GRP" in Source or Destination
4. It will resolve to "TEST_GRP net" after saving

Expected behavior

Only the created Alias should be selected.

Environment

Software version used and hardware type if relevant, e.g.:

OPNsense 25.1.2 (amd64).