Use single-line WTOs for single-line messages

[ifakhrutdinov]

Proposed changes

This pull-request adjusts the wtoPtintf2 function, which is intended for printing single-line messages, to use the proper WTO call and issue single-line WTO messages.

This PR addresses Issue: #509

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

PR Checklist

Please delete options that are not relevant.

• If the changes in this PR are meant for the next release / mainline, this PR targets the "staging" branch.
• My code follows the style guidelines of this project (see: Contributing guideline)
• New and existing unit tests pass locally with my changes
• Relevant update to CHANGELOG.md
• My changes generate no new warnings

Testing

• Start our ZIS;
• Verify that, in the JESMSGLG log, the ZIS single-line WTO messages like ZWES0109I have no numbers at the end:

incorrect:    ZWES0109I Core server ready 690
correct:      ZWES0109I Core server ready

• Multi-line messages (e.g., ZWES0200I) should still have the numbers indicating multiple-lines:

08.39.55 S0442115  ZWES0200I Modify commands:  165
   165                        DISPLAY [OPTION_NAME] - Print service information
   165                          OPTION_NAME:
   165                            CONFIG - Print server configuration information (defau
   165                        FLUSH   - Print all pending log messages
   165                        LOG <COMP_ID> <LOG_LEVEL> - Set log level
   165                          COMP_ID:
   165                            CMS   - Cross memory server
   165                            CMSPC - PC routines
   165                            STC   - STC base
   165                          LOG_LEVEL:
   165                            SEVERE
   165                            WARNING
   165                            INFO
   165                            DEBUG
   165                            DEBUG2
   165                            DEBUG3

Further comments