recent notebooks are not colored until pagination is enabled

[gordonwoodhull]

The coloring is invoked by the pagination code, which doesn't get hit unless

https://github.com/att/rcloud/blob/d345b8bb9ca0c23db2aa1e0d36ce6e3cd743a51c/htdocs/editor_tab.js#L614

Looks like one of the invocations of the color_coder could be safely moved out of the if-block.