Qt: Allow copying the version string from interface settings

Author: Pesa

src/duckstation-qt/interfacesettingswidget.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>652</width>
-    <height>483</height>
+    <height>490</height>
    </rect>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout">
@@ -193,8 +193,8 @@
       </item>
       <item row="1" column="1">
        <widget class="QLabel" name="autoUpdateCurrentVersion">
-        <property name="text">
-         <string/>
+        <property name="textInteractionFlags">
+         <set>Qt::TextInteractionFlag::TextSelectableByMouse</set>
         </property>
        </widget>
       </item>