Use macro in CFE_ResourceId_IsDefined

**Is your feature request related to a problem? Please describe.**
Compares directly to 0
See https://github.com/nasa/cFE/pull/1283#discussion_r611506161

**Describe the solution you'd like**
Use macro

**Describe alternatives you've considered**
None

**Additional context**
Code review #1283

**Requester Info**
Jacob Hageman - NASA/GSFC, submitted by @ezpollack
