Make "Assign / Claim" stacked action work properly in Maniphest

Summary:
Ref T9132. This is kind of a mess because the tokenizer rewrite left rendering tokenizers in Javascript a little rough. This causes bugs like icons not showing up on tokens in the "Policy" dialog, which there's a task for somewhere I think.

I think I've fixed it enough that the beahavior is now correct (i.e., icons show up properly), but some of the code is a bit iffy. I'll eventually clean this up properly, but it's fairly well contained for now.

Test Plan:
  - Reassigned a task.
  - Put a task up for grabs.
  - No reassign on closed tasks.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9132

Differential Revision: https://secure.phabricator.com/D14669

webroot/rsrc/js/phuix/PHUIXFormControl.js

@@ -118,16 +118,21 @@ JX.install('PHUIXFormControl', {
         spec.config);
       build.tokenizer.start();
 
+      function set_value(map) {
+        for (var k in map) {
+          var v = JX.Prefab.transformDatasourceResults(map[k]);
+          build.tokenizer.addToken(k, v);
+        }
+      }
+
+      set_value(spec.value || {});
+
       return {
         node: build.node,
         get: function() {
           return JX.keys(build.tokenizer.getTokens());
         },
-        set: function(map) {
-          for (var k in map) {
-            build.tokenizer.addToken(k, map[k]);
-          }
-        }
+        set: set_value
       };
     },