Remove margins from symbol selector

Author: SrNetoChan

src/ui/qgssymbolselectordialogbase.ui

@@ -14,7 +14,16 @@
    <string>Form</string>
   </property>
   <layout class="QGridLayout" name="gridLayout_2">
-   <property name="margin">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
     <number>9</number>
    </property>
    <item row="1" column="0">
@@ -150,8 +159,7 @@
           <verstretch>0</verstretch>
          </sizepolicy>
         </property>
-        <widget class="QWidget" name="page_2">
-        </widget>
+        <widget class="QWidget" name="page_2"/>
        </widget>
       </item>
      </layout>