Inconsistent unit MBq

Fixed capital letter

This solves RDF schema violations like the following:

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| resultSeverity | resultPath  | sourceConstraintComponent    | sourceShape                              | count | focusNode                                                                                                         | resultMessage                                                                                                                                                                                                                                                         | value                                                                                      |
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| sh:Violation   | ns1:hasCode | sh:ClassConstraintComponent  | _:b0                                     | 2     | resource:CHE-115_861_419-sphn-Unit-abbebeba-ba3f-42cc-93e5-95311968adcb                                           | "ClassConstraint[<https://biomedit.ch/rdf/sphn-resource/ucum/UCUM>]: Expected class :<https://biomedit.ch/rdf/sphn-resource/ucum/UCUM> for <https://biomedit.ch/rdf/sphn-resource/CHE-115_861_419-sphn-Unit-abbebeba-ba3f-42cc-93e5-95311968adcb-sphn-Code-UCUM-Mbq>" | resource:CHE-115_861_419-sphn-Unit-abbebeba-ba3f-42cc-93e5-95311968adcb-sphn-Code-UCUM-Mbq |
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