[fix] make /preferences more CSP compliant - simple & oscar theme

In simple & oscar theme remove ``style=`` properties which violates CSP but seem
not to have a magnification in GUI (UX).

Fixed files::

    ./oscar/preferences.html:25:<td class="{{ label }}" style="padding: 2px">{{- "" -}}
    ./simple/preferences.html:39:<td class="{{ label }}" style="padding: 2px; width: 13rem;">{{- "" -}}
    ./simple/preferences.html:77:    <div class="engine-tooltip" style="right: 12rem;" role="tooltip" id="{{engine_name}}_reliability">
    ./simple/preferences.html:258:     <p class="text-muted" style="margin:20px 0;">

Reported-by: https://github.com/searxng/searxng/issues/57
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/templates/oscar/preferences.html

@@ -22,7 +22,7 @@
 {%- endmacro %}
 
 {%- macro engine_time(engine_name, css_align_class) -%}
-<td class="{{ label }}" style="padding: 2px">{{- "" -}}
+<td class="{{ label }}">{{- "" -}}
     {%- if stats[engine_name].time != None -%}
     <span class="stacked-bar-chart-value">{{- stats[engine_name].time -}}</span>{{- "" -}}
     <span class="stacked-bar-chart" aria-labelledby="{{engine_name}}_chart" aria-hidden="true">

searx/templates/simple/preferences.html

@@ -36,7 +36,7 @@
 {%- endmacro %}
 
 {%- macro engine_time(engine_name) -%}
-<td class="{{ label }}" style="padding: 2px; width: 13rem;">{{- "" -}}
+<td class="{{ label }}">{{- "" -}}
     {%- if stats[engine_name].time != None -%}
     <span class="stacked-bar-chart-value">{{- stats[engine_name].time -}}</span>{{- "" -}}
     <span class="stacked-bar-chart" aria-labelledby="{{engine_name}}_chart" aria-hidden="true">
@@ -76,7 +76,7 @@
           {{ icon('warning', 'The engine is not reliabled') }} {{ r -}}
       </span>{{- "" -}}
     </a>{{- "" -}}
-    <div class="engine-tooltip" style="right: 12rem;" role="tooltip" id="{{engine_name}}_reliability">
+    <div class="engine-tooltip" role="tooltip" id="{{engine_name}}_reliability">
         {%- if checker_result -%}
         <p>{{ _("Failed checker test(s): ") }} {{ ', '.join(checker_result) }}</p>
         {%- endif -%}
@@ -257,7 +257,7 @@
 
   {{ tab_header('maintab', 'cookies', _('Cookies')) }}
 
-     <p class="text-muted" style="margin:20px 0;">
+     <p class="text-muted">
         {{ _('This is the list of cookies and their values searx is storing on your computer.') }}<br />
         {{ _('With that list, you can assess searx transparency.') }}<br />
      </p>