app: handle DB Liniennormalisierung (remove redundancy in type / line name)

    % if ($departure->{train_type} and $departure->{train_no}) {

%=    $departure->{train_type}

%   }

%   if ($departure->{train_type} and $departure->{train_type}) {

%     $departure->{train_line} =~ s{ \Q$departure->{train_type}\E (?= \d ) }{}x;

%   }

%   if ($departure->{train_line} ) {

%=    $departure->{train_line}

%   }