Update guiwindow.ui to reflect new Rumble FF Autofire behaviour (#9)

When Autofire Enabled is ticked, along with the Rumble FF option, the rumble motor now follows expected behaviour and rumbles continuously as well. Solenoid timings are respected, so adjusting those adjust the rumble motor behaviour.

guiwindow.ui

@@ -248,7 +248,7 @@
              <item>
               <widget class="QCheckBox" name="autofireToggle">
                <property name="toolTip">
-                <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Set if solenoid full auto is enabled.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+                <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Enable for continuous automatic solenoid feedback while trigger depressed.&lt;/p&gt;&lt;p&gt;Note that if &lt;span style=&quot; font-style:italic;&quot;&gt;Rumble FF&lt;/span&gt; is enabled, this option will provide continuous rumble motor feedback instead.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
                </property>
                <property name="text">
                 <string>Autofire Enabled</string>