[fix] make /stats more CSP compliant - github issue form

Hide textarea from github issue form::

    ./__common__/new_issue.html:6:    <textarea name="body" style="display: none;">{{- '' -}}

BTW: fix indentation.

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

searx/static/themes/__common__/less/new_issue.less

@@ -1,14 +1,19 @@
 .github-issue-button {
-  display: block;
-  padding: 8px 16px;
-  font-family: sans-serif;
-  font-size: 16px;
-  color: white;
-  background-color: #238636 !important; /* important is needed cause to an !important in logicodev-dark */
-  border: #2ea043;
-  border-radius: 10px !important;
-  box-shadow: rgba(0, 0, 0, 0) 0px 0px 0px 0px;
+    display: block;
+    padding: 8px 16px;
+    font-family: sans-serif;
+    font-size: 16px;
+    color: white;
+    background-color: #238636 !important; /* important is needed cause to an !important in logicodev-dark */
+    border: #2ea043;
+    border-radius: 10px !important;
+    box-shadow: rgba(0, 0, 0, 0) 0px 0px 0px 0px;
 }
+
 .github-issue-button:hover {
-  background-color: #2ea043;
+    background-color: #2ea043;
+}
+
+.issue-hide {
+    display: none;
 }

searx/templates/__common__/new_issue.html

@@ -3,7 +3,7 @@
     <input name="title" type="hidden" value="Bug: {{ engine_name }} engine">
     <input name="labels" type="hidden" value="bug">
     <input name="template" type="hidden" value="bug-report.md">
-    <textarea name="body" style="display: none;">{{- '' -}}
+    <textarea name="body" class="issue-hide">{{- '' -}}
 
 **Version of SearXNG, commit number if you are using on master branch and stipulate if you forked SearXNG**
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