gui: Prevent status icons from being cut off

After the Qt5 switch, status icons were being cut off by 1-2px.

Also fixes some other cases where the UI is slightly off mentioned in #3800.

Fixes #3800.

src/qt/forms/addressbookpage.ui

@@ -122,6 +122,12 @@
      </item>
      <item>
       <widget class="QPushButton" name="closeButton">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Minimum" vsizetype="Minimum">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="text">
         <string>C&amp;lose</string>
        </property>