Hopefully fix collection visibility once and for all (#4070)

* Hopefully fix collection visibility once and for all

Follow up to #3408 and #3864

* Use same unlisted approach for collections as is used for projects

apps/labrinth/src/models/v3/collections.rs

@@ -92,7 +92,7 @@ impl CollectionStatus {
         }
     }
 
-    // Project pages + info cannot be viewed
+    // Collection pages + info cannot be viewed
     pub fn is_hidden(&self) -> bool {
         match self {
             CollectionStatus::Rejected => true,
@@ -103,6 +103,11 @@ impl CollectionStatus {
         }
     }
 
+    // Collection can be displayed in on user page
+    pub fn is_searchable(&self) -> bool {
+        matches!(self, CollectionStatus::Listed)
+    }
+
     pub fn is_approved(&self) -> bool {
         match self {
             CollectionStatus::Listed => true,