PMIX_Info_load BOOL with NULL sets value to true

[abouteiller]

Add that setting NULL as the data param for PMIX_BOOL types in PMIx_Info_load will set the info value to true.

[jjhursey]

PMIx ASC 3Q 2023 Voting results:

• Yes: 6
• No: 0
• Abstain: 0
• Result: Pass as Errata. Can be merged at the discretion of Co-Chairs/RMs.