webpack: Enable explicitPartialContext for handlebars-loader.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

web/templates/inbox_view/inbox_list.hbs

@@ -25,5 +25,5 @@
 </div>
 
 <div id="inbox-streams-container">
-    {{> inbox_stream_container }}
+    {{> inbox_stream_container . }}
 </div>

web/templates/inbox_view/inbox_row.hbs

@@ -1,5 +1,5 @@
 {{#if is_stream}}
-    {{> inbox_stream_header_row}}
+    {{> inbox_stream_header_row .}}
 {{else}}
     <div id="inbox-row-conversation-{{conversation_key}}" class="inbox-row {{#if is_hidden}}hidden_by_filters{{/if}} {{#if is_collapsed}}collapsed_container{{/if}}" tabindex="0" data-col-index="{{ column_indexes.RECIPIENT }}">
         <div class="inbox-focus-border">

web/templates/inbox_view/inbox_stream_header_row.hbs

@@ -6,7 +6,7 @@
                 <div tabindex="0" class="inbox-header-name">
                     <div class="inbox-header-name-focus-border">
                         <span class="stream-privacy-original-color-{{stream_id}} stream-privacy filter-icon" style="color: {{stream_color}}">
-                            {{> ../stream_privacy }}
+                            {{> ../stream_privacy . }}
                         </span>
                         <a tabindex="-1" href="{{stream_url}}">{{stream_name}}</a>
                         {{#if is_archived}}

web/templates/inbox_view/inbox_view.hbs

@@ -12,6 +12,6 @@
     </div>
     {{> inbox_no_unreads}}
     <div id="inbox-list">
-        {{> inbox_list}}
+        {{> inbox_list .}}
     </div>
 </div>