Werk #13113: Fix missing option to modify refresh interval

When viewing combined graphs or graph collections, the refresh interval was always 60 seconds without an option to modify.

The "Combined graphs" and "Graph collection" pages have now the "Display" menu entry "Modify display options" to edit this setting for the current viewed graphs.

Please note that this settings are currently not stored. So if you leave the page and call it again, the refresh interval will be set to default of 60 seconds. You can use bookmarks if you visit certain combined graphs or graph collections regularly.

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