Get the "Edit High Level Source" link back in. Broken with xblock work.

https://edx.lighthouseapp.com/projects/102637-studio/tickets/273

cms/static/js/base.js

@@ -225,7 +225,6 @@ function toggleSections(e) {
 function editSectionPublishDate(e) {
     e.preventDefault();
     $modal = $('.edit-subsection-publish-settings').show();
-    $modal = $('.edit-subsection-publish-settings').show();
     $modal.attr('data-id', $(this).attr('data-id'));
     $modal.find('.start-date').val($(this).attr('data-date'));
     $modal.find('.start-time').val($(this).attr('data-time'));

cms/templates/widgets/source-edit.html

@@ -12,7 +12,7 @@
 
     <form id="hls-form" enctype="multipart/form-data">
       <section class="source-edit">
-          <textarea name="" data-metadata-name="source_code" class="source-edit-box hls-data" rows="8" cols="40">${metadata['source_code']|h}</textarea>
+          <textarea name="" data-metadata-name="source_code" class="source-edit-box hls-data" rows="8" cols="40">${editable_metadata_fields['source_code']|h}</textarea>
       </section>
       <div class="submit">
         <button type="reset" class="hls-compile">Save &amp; Compile to edX XML</button>

common/lib/xmodule/xmodule/capa_module.py

@@ -99,6 +99,7 @@ class CapaFields(object):
     seed = StringyInteger(help="Random seed for this student", scope=Scope.user_state)
     weight = StringyFloat(help="How much to weight this problem by", scope=Scope.settings)
     markdown = String(help="Markdown source of this module", scope=Scope.settings)
+    source_code = String(help="Source code for LaTeX and Word problems. This feature is not well-supported.", scope=Scope.settings)
 
 
 class CapaModule(CapaFields, XModule):

common/lib/xmodule/xmodule/templates/html/latex_html.yaml

 ---
 metadata:
-    display_name: E-text Written in LaTeX 
-    source_processor_url: https://qisx.mit.edu:5443/latex2edx
+    display_name: E-text Written in LaTeX
     source_code: |
         \subsection{Example of E-text in LaTeX}
 

common/lib/xmodule/xmodule/templates/problem/latex_problem.yaml

 ---
 metadata:
-    display_name: Problem Written in LaTeX 
-    source_processor_url: https://studio-input-filter.mitx.mit.edu/latex2edx
+    display_name: Problem Written in LaTeX
     source_code: |
         % Nearly any kind of edX problem can be authored using Latex as
         % the source language.  Write latex as usual, including equations.  The

common/lib/xmodule/xmodule/templates/problem/problem_with_hint.yaml

 ---
 metadata:
     display_name: Problem with Adaptive Hint
-    source_processor_url: https://qisx.mit.edu:5443/latex2edx
     source_code: |
         \subsection{Problem With Adaptive Hint}