fix pykig shebang sed invocation, again (#1840510)
    
    * Wed May 27 2020 Kevin Kofler <Kevin@tigcc.ticalc.org> - 20.04.1-2
    - fix pykig shebang sed invocation, again (#1840510)
    
    Changing the sed line was just wrong. The reason my sed line did not
    work as is for your 19.12.x builds is because the "Port pykig to python
    3" patch was NOT upstreamed into 19.12.x, only into 20.04.x, so it was
    wrong to drop the patch in the 19.12.x builds.