Fix loading of `xls_sheet` and `xls_range` in mom

The problem is caused by dseries#51 and was reported in https://forum.dynare.org/t/mom-in-dynare-5-0-does-not-load-correct-xls-sheet/19693

added bug method of moments labels

changed title from Fix loading of xls_sheet in mom to Fix loading of xls_sheet {+and xls_range +}in mom

mentioned in commit JohannesPfeifer/dynare@43e23df4

mentioned in merge request !2010 (closed)

mentioned in commit JohannesPfeifer/dynare@73b13343

mentioned in merge request !2014 (merged)

closed

reopened

mentioned in commit JohannesPfeifer/dynare@176baa22

closed with commit 176baa22

closed with commit 82070e40

mentioned in commit 9cc0acab

mentioned in commit 82070e40