When sorting by metric status, change sequence of colours

[Sebastiaan127001]

As discussed, the right order should be:
White
Red
Yellow/Amber
Grey
Green

I.e. reverse yellow and grey.

[fniessink]

In SubjectDetails.js, sorting by status is currently done as follows:

        status: (m1, m2) => {
            const attribute1 = status_order[get_metric_status(m1[1])];
            const attribute2 = status_order[get_metric_status(m2[1])];
            return attribute1.localeCompare(attribute2)
        },

And status_order is defined as:

    const status_order = { "": "0", target_not_met: "1", debt_target_met: "2", near_target_met: "3", target_met: "4" }; 

This should become:

    const status_order = { "": "0", target_not_met: "1",  near_target_met: "2", debt_target_met: "3", target_met: "4" };