panel/RRDCharts: enable scrolling for RRDCharts on touchscreens
quote from extjs docs (AbstractChart.js):
If you do have a chart inside a scrollable view, even if it has no
interactions, you have to set its touchAction config to the following:
touchAction: {
panX: true,
panY: true
}
Otherwise, if a touch action started on a chart,
a swipe will not scroll the view.
Since we have RRDCharts always in a scrollable view, and it does not seem to
hurt non-touchscreens, enable it by default so that users on touchscreens
can scroll it.
Reported by users in the forum:
https://forum.proxmox.com/threads/minor-but-annoying-ipad-swipe-bug.93686