Reduce margins on bookmarks dialog

src/ui/qgsbookmarksbase.ui

@@ -14,13 +14,9 @@
    <string>Geospatial Bookmarks</string>
   </property>
   <layout class="QGridLayout">
-   <item row="1" column="0">
-    <widget class="QDialogButtonBox" name="buttonBox">
-     <property name="standardButtons">
-      <set>QDialogButtonBox::Close|QDialogButtonBox::Help</set>
-     </property>
-    </widget>
-   </item>
+   <property name="margin">
+    <number>0</number>
+   </property>
    <item row="0" column="0">
     <widget class="QTreeView" name="lstBookmarks">
      <property name="selectionMode">
@@ -34,12 +30,34 @@
      </property>
     </widget>
    </item>
+   <item row="3" column="0">
+    <layout class="QHBoxLayout" name="horizontalLayout_2">
+     <property name="leftMargin">
+      <number>3</number>
+     </property>
+     <property name="topMargin">
+      <number>0</number>
+     </property>
+     <property name="rightMargin">
+      <number>3</number>
+     </property>
+     <property name="bottomMargin">
+      <number>3</number>
+     </property>
+     <item>
+      <widget class="QDialogButtonBox" name="buttonBox">
+       <property name="standardButtons">
+        <set>QDialogButtonBox::Close|QDialogButtonBox::Help</set>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
   </layout>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <tabstops>
   <tabstop>lstBookmarks</tabstop>
-  <tabstop>buttonBox</tabstop>
  </tabstops>
  <resources/>
  <connections>