feat(search): Allow to search in a dedicated other conversation with a filter

[nickvergessen]

☑️ Resolves

• API change for 🔍🗨️ Unified Search in individual Talk room server#42914

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included or not possible
• 📘 API documentation in docs/ has been updated or is not required
• 🔖 Capability is added or not needed

[nickvergessen]

CS fix:

diff --git a/lib/Search/MessageSearch.php b/lib/Search/MessageSearch.php
index 77212af91..1714a6250 100644
--- a/lib/Search/MessageSearch.php
+++ b/lib/Search/MessageSearch.php
@@ -127,7 +127,7 @@ class MessageSearch implements IProvider, IFilteringProvider {
                        } catch (RoomNotFoundException) {
                                return SearchResult::complete($title, []);
                        }
-               } else if ($filter) {
+               } elseif ($filter) {
                        // The filter is the "Current conversation" so the CurrentMessageSearch will handle it
                        return SearchResult::complete($title, []);
                } else {