Reduce the update frequency of the log panel to 5hz (#734)

The update frequency of the log panel was erroneously set to every 5ms
(200hz). This was causing a lot of unnecessary processing that was
discovered during QML profiling.

This should help the app run significantly better on lower end hardware.

Author: keithel-qt

resources/LogPanel.qml

@@ -262,7 +262,7 @@ Item {
     }
 
     Timer {
-        interval: Globals.currentRefreshRate
+        interval: Utils.hzToMilliseconds(Globals.currentRefreshRate)
         running: parent.visible
         repeat: true
         onTriggered: {