pulsarpputils.py: remove extra DIST definition
In pulsarpputils.py
in the float_keys
list there were two copies of DIST
when only one is needed. This isn't a major problem, but it does lead to lalapps_knope
creating two DIST
entries if it is required to create a parameter correlation coefficient file. This merge request is very simple and just removes one of the DIST
entries.
cc @karl-wette