GUI: Disable tab navigation for peers tables.

Fix a bug in which the Peers tab of the debug window
does not allow navigation to other tabs via Ctrl[+Shift]+Tab.

src/qt/forms/debugwindow.ui

@@ -905,6 +905,9 @@
            <property name="horizontalScrollBarPolicy">
             <enum>Qt::ScrollBarAsNeeded</enum>
            </property>
+           <property name="tabKeyNavigation">
+            <bool>false</bool>
+           </property>
            <property name="sortingEnabled">
             <bool>true</bool>
            </property>
@@ -966,6 +969,9 @@
            <property name="horizontalScrollBarPolicy">
             <enum>Qt::ScrollBarAsNeeded</enum>
            </property>
+           <property name="tabKeyNavigation">
+            <bool>false</bool>
+           </property>
            <property name="sortingEnabled">
             <bool>true</bool>
            </property>