Add vertical spacer

Author: JosuGZ

src/qt/forms/debugwindow.ui

@@ -1480,6 +1480,19 @@
                  </property>
                 </widget>
                </item>
+               <item row="18" column="0">
+                <spacer name="verticalSpacer_3">
+                 <property name="orientation">
+                  <enum>Qt::Vertical</enum>
+                 </property>
+                 <property name="sizeHint" stdset="0">
+                  <size>
+                   <width>20</width>
+                   <height>40</height>
+                  </size>
+                 </property>
+                </spacer>
+               </item>
               </layout>
              </widget>
             </widget>