More elegant fix for settings size

Is the exact minimum size it can get

ui/settingsdlg.ui

@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>100</width>
-    <height>100</height>
+    <width>680</width>
+    <height>656</height>
    </rect>
   </property>
   <property name="windowTitle">