Switch to side-by-side view

--- a/src/qtgui/advsearch.ui
+++ b/src/qtgui/advsearch.ui
@@ -95,12 +95,6 @@
                 <property name="sizeType">
                   <enum>Expanding</enum>
                 </property>
-                <property name="sizeHint">
-                  <size>
-                    <width>0</width>
-                    <height>0</height>
-                  </size>
-                </property>
               </spacer>
               <widget class="QPushButton">
                 <property name="name">