Correct assumption names for cardiac cath

[yiwen-h]

CARDIAC_CATH_PROC_TIME
CARDIAC_CATH_PROC_UTIL
CARDIAC_CATH_PROC_ANNUAL_OPERATIONAL_HOURS
on the https://the-strategy-unit.github.io/open-plan-docs/functional-areas/labs-cardiac-cath-proc/#assumptions page

but in assumptions register there is the prefix LABS_