fixes #1684: NCM::Component::spma::dnf: Update dnf.pm

[ulrich1919]

Add repository option "module_hotfixes"

Ensure the title of this pull-request starts with the component name followed by a colon, e.g.

ncm-spma: add repository option "module_hotfixes"

Describe the change you are making here, in particular we would like to know:

• Why the change is necessary. See #1684
• What backwards incompatibility it may introduce. None

[stdweird]

how odd. we have repo files with module_hotfixes...

[stdweird]

nvm, this is dnf.pm, not yumdnf.pm

[aka7]

nvm, this is dnf.pm, not yumdnf.pm yeh, I think we are the only ones using dnf backend not yumdnf.