DEV: replace "warning" icons with "exclamation-triangle"

app/assets/javascripts/admin/templates/modal/admin-badge-preview.hbs

@@ -26,7 +26,7 @@
     {{#if countWarning}}
       <div class="count-warning">
         <p class="heading">
-          {{d-icon "warning"}}
+          {{d-icon "exclamation-triangle"}}
           {{i18n "admin.badges.preview.bad_count_warning.header"}}
         </p>
         <p class="body">

app/assets/javascripts/discourse/templates/components/edit-category-general.hbs

@@ -1,6 +1,6 @@
 {{#if category.isUncategorizedCategory}}
   <p class="warning">
-    {{d-icon "warning"}}
+    {{d-icon "exclamation-triangle"}}
     {{{i18n 'category.uncategorized_general_warning' settingLink=uncategorizedSiteSettingLink customizeLink=customizeTextContentLink}}}
   </p>
 {{/if}}

app/assets/javascripts/discourse/templates/components/future-date-input.hbs

@@ -35,7 +35,7 @@
 
     {{#if willCloseImmediately}}
       <div class="warning">
-        {{d-icon "warning"}}
+        {{d-icon "exclamation-triangle"}}
         {{willCloseI18n}}
       </div>
     {{/if}}