UpperCase for submaps is not preserved during uploading zipped map

Upload of a new project with the submaps, submaps are displayed in left panel with Lower Case name; even though inside the mapping file and xml files have UpperCase names.

added BUG label

changed milestone to %v14.0.3

created merge request !969 (merged) to address this issue

mentioned in merge request !969 (merged)

closed via merge request !969 (merged)

mentioned in commit 07aee22c