ui,ruleseditor: removed placeholder text

to avoid confussion.

Closes: #1524

Author: gustavo-iniguez-goya

ui/opensnitch/res/ruleseditor.ui

@@ -107,9 +107,6 @@
          <property name="toolTip">
           <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;The value of this field is always the absolute path to the executable: /path/to/binary&lt;br/&gt;&lt;/p&gt;&lt;p&gt;Examples:&lt;/p&gt;&lt;p&gt;- Simple: /path/to/binary&lt;/p&gt;&lt;p&gt;- Multiple paths: ^/usr/lib(64|)/firefox/firefox$&lt;/p&gt;&lt;p&gt;- Multiple binaries: ^(/usr/sbin/ntpd|/lib/systemd/systemd-timesyncd|/usr/bin/xbrlapi|/usr/bin/dirmngr)$ &lt;/p&gt;&lt;p&gt;- Deny/Allow executions from /tmp:&lt;/p&gt;&lt;p&gt;^/(var/|)tmp/.*$&lt;br/&gt;&lt;/p&gt;&lt;p&gt;For more examples visit the &lt;a href=&quot;https://github.com/evilsocket/opensnitch/wiki/Rules-examples&quot;&gt;wiki page&lt;/a&gt; or ask on the &lt;a href=&quot;https://github.com/evilsocket/opensnitch/discussions&quot;&gt;Discussion forums&lt;/a&gt;.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
          </property>
-         <property name="placeholderText">
-          <string notr="true">/path/to/executable, .*/bin/executable[0-9\.]+$, ...</string>
-         </property>
         </widget>
        </item>
        <item row="3" column="1">
@@ -352,9 +349,6 @@ or a single domain:
 www.gnu.org - it'll only match www.gnu.org, nor ftp.gnu.org, nor www2.gnu.org, ...
 gnu.org         - it'll only match gnu.org, nor www.gnu.org, nor ftp.gnu.org, ...</string>
          </property>
-         <property name="placeholderText">
-          <string>www.domain.org, .*\.domain.org</string>
-         </property>
         </widget>
        </item>
        <item row="6" column="0">