[fix] simple theme - preferences: fix tooltip overflow

Suggested-by: @dalf https://github.com/searxng/searxng/pull/295#discussion_r703370358
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/static/themes/simple/src/less/preferences.less

@@ -1,3 +1,9 @@
+.column-reliability {
+  .engine-tooltip {
+    right: 12rem;
+  }
+}
+
 #main_preferences {
   form {
     width: 100%;

searx/templates/simple/preferences.html

@@ -70,7 +70,7 @@
     {% set r = '' %}
 {% endif %}
 {% if checker_result or errors %}
-<td class="{{ label }}">{{- "" -}}
+<td class="{{ label }} column-reliability">{{- "" -}}
     <a href="{{ url_for('stats', engine=engine_name|e) }}">{{- "" -}}
       <span aria-labelledby="{{engine_name}}_reliability">
           {{ icon('warning', 'The engine is not reliabled') }} {{ r -}}