remove pre-release marker from debian changelog version
remove pre-release marker from debian changelog version

The tilde interferes with the less compiler causing quoting issues
for paths as everything before and including the tilde character
gets stripped from the DIR_BUILD/build-root variable.

This is arguably a bug in the less compiler.

stadtgestalten/stadtgestalten,stadtgestalten/stadtgestalten,stadtgestalten/stadtgestalten