Fix rescaling of internal tide of debugging code

[Hallberg-NOAA]

Corrected the internal tide rescaling arguments so that some of the debugging variables have units that are consistent with their documented units. This involved changing the scale arguments to global_area_integral() to tmp_scale arguments in 8 places so that the units of the output retain the scaling of the input variable. The multiplication by the reverse of the scaling factor was also added to 4 debugging output messages.

Also replaced the scale argument to 35 chksum() calls with the equivalent but preferred unscale argument, following the pattern elsewhere in the MOM6 code.

All answers are bitwise identical, and only debugging code was modified.

[awallcraft]

Pull request #764 notes that MOM_internal_tides.F90 may be defining or calculating frequency incorrectly. So far as I can tell this does not impact the debugging code changed here, but any test cases used to confirm the diagnostics may be able to resolve the frequency issue.

[Hallberg-NOAA]

The code itself was not incorrect, per se, but it was inconsistent with the descriptions of the units of the debugging diagnostic variables in the comments describing them. The revised code will give equivalent model output, but it is now internally self-consistent with how it is described. I agree that this PR should be essentially independent of the corrections being made in PR #764.