Fixes #3034. Convert Cap time print to colons

[mathomp4]

Types of change(s)

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Trivial change (affects only documentation or cleanup)
• Refactor (no functional changes, no api changes)

Checklist

• Tested this change with a run of GEOSgcm
• Ran the Unit Tests (make tests)

Description

In one of the most exciting PRs ever, we change:

CAP: INFO:                            Current Time =   21/00/00

to:

CAP: INFO:                            Current Time =   21:00:00

I also changed that time print in a markdown file for one of the tutorials.

Related Issue

Closes #3034