Make the banned section separated with a splitter

[GUI] Minor usability fix.

src/qt/forms/debugwindow.ui

@@ -13,7 +13,7 @@
   <property name="windowTitle">
    <string>Debug window</string>
   </property>
-  <layout class="QVBoxLayout" name="verticalLayout_2">
+  <layout class="QVBoxLayout" name="verticalLayout_6">
    <item>
     <widget class="QTabWidget" name="tabWidget">
      <property name="currentIndex">
@@ -773,11 +773,10 @@
       </attribute>
       <layout class="QGridLayout" name="gridLayout_2">
        <item row="0" column="0" rowspan="2">
-        <layout class="QVBoxLayout" name="verticalLayout_101">
-         <property name="spacing">
-          <number>0</number>
+        <widget class="QSplitter" name="splitter">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
          </property>
-         <item>
          <widget class="QTableView" name="peerWidget">
           <property name="horizontalScrollBarPolicy">
            <enum>Qt::ScrollBarAsNeeded</enum>
@@ -789,7 +788,8 @@
            <bool>false</bool>
           </attribute>
          </widget>
-         </item>
+         <widget class="QWidget" name="">
+          <layout class="QVBoxLayout" name="bannedStuff">
            <item>
             <widget class="QLabel" name="banHeading">
              <property name="sizePolicy">
@@ -852,6 +852,8 @@
             </widget>
            </item>
           </layout>
+         </widget>
+        </widget>
        </item>
        <item row="0" column="1">
         <widget class="QLabel" name="peerHeading">