Subreddit rules: Fix other_reason input in report dialog

The `other_reason` input needs to be enabled properly since
`.report-action-form` isn't being used in the report dialog anymore.

r2/r2/public/static/js/report.js

@@ -5,6 +5,23 @@ $(function() {
     return false
   }
 
+  function toggleOther() {
+    var $reportForm = $(this).closest('.reportform');
+    var $submit = $reportForm.find('[type="submit"]');
+    var $reason = $reportForm.find('[name=reason]:checked');
+    var $other = $reportForm.find('[name="other_reason"]');
+    var isOther = $reason.val() === 'other';
+
+    $submit.removeAttr('disabled');
+
+    if (isOther) {
+      $other.removeAttr('disabled').focus();
+    } else {
+      $other.attr('disabled', 'disabled');
+    }
+    return false
+  }
+
   function getReportAttrs($el) {
     return {thing: $el.thing_id()}
   }
@@ -39,4 +56,5 @@ $(function() {
 
   $("div.content").on("click", ".tagline .reportbtn, .thing .reportbtn", openReportForm);
   $("div.content").on("click", ".btn.report-cancel", toggleReportForm);
+  $("div.content").on("change", "input[name='reason']", toggleOther);
 });

r2/r2/templates/reportform.html

@@ -61,7 +61,7 @@
         <input name="other_reason" value="" maxlength="100" type="text" disabled>
       </li>
     </ol>
-    <button type="submit" class="btn submit-action-thing">
+    <button type="submit" class="btn submit-action-thing" disabled>
       ${_("submit")}
     </button>
     <button type="button" class="btn cancel-action-thing report-cancel">

r2/r2/templates/subredditreportform.html

@@ -61,7 +61,7 @@
         <input name="other_reason" value="" maxlength="100" type="text" disabled>
       </li>
     </ol>
-    <button type="submit" class="btn submit-action-thing">
+    <button type="submit" class="btn submit-action-thing" disabled>
       ${_("submit")}
     </button>
     <button type="button" class="btn report-cancel">