Apply patch from Nathan Woodrow to resolve attribute dialog save button issue #4290

Author: timlinux

src/ui/qgsattributetabledialog.ui

@@ -254,7 +254,7 @@
         <string>Ctrl+E</string>
        </property>
        <property name="checkable">
-        <bool>true</bool>
+        <bool>false</bool>
        </property>
       </widget>
      </item>