Resolve "IVAS_rend custom loudspeaker output tests limited in inputs"

• Related issues: #1327 (closed)
• Requested reviewers: @pihlajakuja

Reason why this change is needed

• Custom LS tests were unintentionally limiting the input formats that are tested by only limiting to presentation formats.

Description of the change

• The testcase is updated to cover ISM and MASA, which were previously missing.

Affected operating points

• N/A tests only

Related to #1327 (closed)