Invalidate map size after updating telemetry table

[argilo]

The updateTelemetryTable function can change the size of the telemetry table, which in turn changes the size of the map. (This occurs on startup when the table footer is hidden, and again whenever any new sondes appear.) But the function doesn't call mymap.invalidateSize(), which leaves the map incorrectly centered, at least on Firefox. (If the browser window is resized, then the map snaps back into place.)

Here I've added mymap.invalidateSize() to the end of the function. Although updateTelemetryTable is called frequently (at least once per second) I expect that this shouldn't cause performance problems because invalidateSize returns quickly if the map has not in fact changed size.