popovers: Align user profile popover with right col USERS header.

frontend_tests/zjsunit/zjquery.js

@@ -363,6 +363,12 @@ exports.make_new_elem = function (selector, opts) {
         slice() {
             return self;
         },
+        offset() {
+            return {
+                top: 0,
+                left: 0,
+            };
+        },
     };
 
     if (selector[0] === "<") {

static/js/popovers.js

@@ -232,7 +232,7 @@ function render_user_info_popover(
         }),
         html: true,
         trigger: "manual",
-        top_offset: 100,
+        top_offset: $("#userlist-title").offset().top + 15,
         fix_positions: true,
     });
     popover_element.popover("show");