Bug#974544: libcharls-dev needs Breaks+Replaces: libdcmtk-dev (<< 3.6.5-1~)

[Mathieu Malaterre]

Control: fixed -1 2.1.0+dfsg-7

https://salsa.debian.org/med-team/charls/-/blob/debian/2.1.0+dfsg-7/debian/control#L22

dcmtk 3.6.5 ships a convenient copy of CharLS with SOVERSION=1, while
libcharls-dev is SOVERSION=2, so I'll not add the Replaces.