Collapse Lists to be per user, not per board. In Progress.

Related #5388

Thanks to xet7 !

models/lists.js

@@ -156,13 +156,6 @@ Lists.attachSchema(
       type: String,
       defaultValue: 'list',
     },
-    collapsed: {
-      /**
-       * is the list collapsed
-       */
-      type: Boolean,
-      defaultValue: false,
-    },
   }),
 );
 
@@ -293,10 +286,6 @@ Lists.helpers({
     return this.starred === true;
   },
 
-  isCollapsed() {
-    return this.collapsed === true;
-  },
-
   absoluteUrl() {
     const card = ReactiveCache.getCard({ listId: this._id });
     return card && card.absoluteUrl();
@@ -317,9 +306,6 @@ Lists.mutations({
   star(enable = true) {
     return { $set: { starred: !!enable } };
   },
-  collapse(enable = true) {
-    return { $set: { collapsed: !!enable } };
-  },
 
   archive() {
     if (this.isTemplateList()) {