fix bug for reading elevation profile

[donghuix]

Fixes reading of elevation profile.

Fixes #7039
[BFB]

[bishtgautam]

@hydrotian, Does this bug impact the default model or any existing tests?

[donghuix]

@hydrotian, Does this bug impact the default model or any existing tests?

This bug does not affect tests when inundation is turned off.

We have added three tests that turn on MOSART inundation: unstructure, rof_ocn_2way, and rof_lnd_2way.
unstructure and rof_ocn_2way use MOSART input file that has ele, thus the bug does not affect those two tests. For rof_lnd_2way, it uses a MOSART input file that does not contain an elevation profile, so hypothetical values are used. So, this bug fix does not affect those three tests with inundation turned on.

@hydrotian Let me know if I missed any tests for MOSART inundation.

[hydrotian]

so hypothetical values are used. So, this bug fix does not affect those three tests with inundation turned on.

That makes sense. In the future maybe we should only use ele instead of ele0, ele1 ... It looks good to me now. Thanks.