fix: Preview: Align link button correctly

Fixes #10997

gajim/data/gui/preview.ui

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- Generated with glade 3.38.2 -->
 <interface>
-  <requires lib="gtk+" version="3.20"/>
+  <requires lib="gtk+" version="3.24"/>
   <object class="GtkBox" id="preview_box">
     <property name="visible">True</property>
     <property name="can-focus">False</property>
@@ -158,8 +158,9 @@
             <child>
               <object class="GtkLinkButton" id="link_button">
                 <property name="can-focus">True</property>
-                <property name="receives-default">True</property>
+                <property name="receives-default">False</property>
                 <property name="no-show-all">True</property>
+                <property name="halign">start</property>
                 <property name="relief">none</property>
               </object>
               <packing>