Merge bitcoin#16090: Qt: Add vertical spacer to peer detail widget

36b0a2f Add vertical spacer (Josu Goñi)

Pull request description:

  Before:

  ![image](https://user-images.githubusercontent.com/25986871/58375408-a8f22c80-7f52-11e9-96ca-14f2186e6fa7.png)

  After:

  ![image](https://user-images.githubusercontent.com/25986871/58375420-fa022080-7f52-11e9-8add-eafe98068e8d.png)

ACKs for commit 36b0a2:
  fanquake:
    utACK bitcoin@36b0a2f
  hebasto:
    tACK 36b0a2f on Linux Mint 19.1, Qt 5.9.5
  fanquake:
    re-utACK bitcoin@36b0a2f
  kristapsk:
    ACK 36b0a2f (tested with Qt 5.11.3 under Linux/Xfce4)
  promag:
    Tested ACK bitcoin@36b0a2f on macos 10.14.3. Resizing the window works as expected.

Tree-SHA512: 26ec9700aa9116ec2c604f8ec7b825b30c83c1d497c21f2191d3585868db4a2e3921de607dea9f7cd9a1ea49361215d738e2aba1936566d85757d87112d73088

src/qt/forms/debugwindow.ui

@@ -1483,6 +1483,19 @@
                  </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>