Web Inspector: Rendering Frames filter checkboxes all become checked during recording

Web Inspector: Rendering Frames filter checkboxes all become checked during recording
https://bugs.webkit.org/show_bug.cgi?id=148375

Reviewed by Timothy Hatcher.

* UserInterface/Views/ChartDetailsSectionRow.js:
(WebInspector.ChartDetailsSectionRow.prototype._createLegend):
Removed incorrect code that forced checked to true.

* UserInterface/Views/TimelineSidebarPanel.js:
(WebInspector.TimelineSidebarPanel._refreshFrameSelectionChart):
Persist legend item checkbox state when updating the chart.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@188861 268f45cc-cd09-0410-ab3c-d52691b4dbfc