Place symbols over rests in layering, for ease of dragging

[RMRattray]

Resolves: #21230

In response to the addressed issue, it was found that obscure symbols were placed over notes, but not over rests, according to the layering in types.h; according to a glance at the file around the time of the pull request, it did used to be the case; this re-ordering places symbols above rests as well, though they do tend not to overlap anyhow. The ordering of the elements in the array in typeconv.cpp was changed in the same manner, owing to a comment in types.h requesting that they be synced; other pre-existing discrepancies in the ordering were allowed to remain for the sake of minimal changes.

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[cbjeukendrup]

Thanks!

[zacjansheski]

Tested on MacOS 15, Windows 11, Ubuntu 22.04.3. Approved
#21230 FIXED

[its-not-nice]

@RMRattray Thanks very much for this - this exact issue was driving me crazy only yesterday!