Temporary workaround: Don't use DEFAULT word in ===

There's an issue where DEFAULT as the first word wins a lookback.

This needs looking at, but is blocking a commit.  Workaround.

scripts/latest-of.reb

@@ -143,7 +143,7 @@ latest-of: func [
  print warning
  ]
 
- === DEFAULT OS TO VERSION RUNNING THIS SCRIPT (OR OS RUNNING BROWSER) ===
+ === 'DEFAULT OS TO VERSION RUNNING THIS SCRIPT (OR OS RUNNING BROWSER) ===
 
  ; If you are running the web build and don't ask for a variant, the most
  ; sensible thing to do is to try and give you a version matching your
@@ -226,7 +226,7 @@ latest-of: func [
  let extension: if (find [0.3.1 0.3.40] os) [".exe"] else [null]
 
 
- === DEFAULT VARIANT TO DEBUG ===
+ === 'DEFAULT VARIANT TO DEBUG ===
 
  ; All stakeholders are requested to use debug builds unless they have a
  ; really good reason not to. The term "checked" may wind up preferred to
@@ -244,7 +244,7 @@ latest-of: func [
  let suffix: if variant = 'release [null] else [join "-" variant]
 
 
- === DEFAULT COMMIT TO THE LAST GREEN-LIT HASH ===
+ === 'DEFAULT COMMIT TO THE LAST GREEN-LIT HASH ===
 
  ; After a build is validated (and verified as being a completed upload), a
  ; file called %last-deploy.short-hash is updated in the build directory.