BUG #13773. Fixed auto-apply issues with plot-selection-over-time.

pqSelectionInputWidget was setting up the default value for the selection input
using a timer. That was happening after the auto-apply timer timed out. Thus,
the apply would happen before the value was set, resulting in the default for
the representation being setup incorrectly. That meant no data would be shown
even the selection-input was setup immediately after when the timer expired.
This fixes that issue by ensure that pqProxyPropertyWidget explicitly does the
initialization and removing the timer logic from pqSelectionInputWidget.

Also added a test to test this.

Change-Id: I6b51801e362b0cbc9aec4a7a370db0b6f32adcb2
Disable render-server test for PlotOverTimeAutoApply.

Since it uses surface selection which is not supported in render-server mode,
disable  PlotOverTimeAutoApply in that configuration.

Change-Id: Ie8ee0150cd3d613e53e0a1e2b03ed552351d80e4
Merge topic 'fix_chart_panels' into next

fee845bf Disable render-server test for PlotOverTimeAutoApply.
fb2e0a22 BUG #13773. Fixed auto-apply issues with plot-selection-over-time.