[ui] remove minimumSize on select button in select by exp. dialog

Author: nirvn

src/ui/qgsexpressionselectiondialogbase.ui

@@ -39,12 +39,6 @@
    </item>
    <item row="1" column="2">
     <widget class="QToolButton" name="mButtonSelect">
-     <property name="minimumSize">
-      <size>
-       <width>0</width>
-       <height>31</height>
-      </size>
-     </property>
      <property name="text">
       <string>...</string>
      </property>