inspector: Ellipsize accessible description.

This string can be long, and we don't want to break the ui

gtk/inspector/misc-info.ui

@@ -660,6 +660,8 @@
                             <property name="visible">true</property>
                             <property name="halign">end</property>
                             <property name="valign">baseline</property>
+                            <property name="ellipsize">end</property>
+                            <property name="max-width-chars">50</property>
                           </object>
                         </child>
                       </object>