find: do not double the "find:" prefix on an invalid -type list

[AlejandroCoronadoN]

A -type/-xtype list that ends in a comma prints the find: prefix twice:

$ find . -type f,
find: find: Last file type in list argument to -type is missing, i.e., list is ending on: ','

GNU prints it once:

$ find . -type f,
find: Last file type in list argument to -type is missing, i.e., list is ending on: ','

The message in type_creator hardcodes a leading find: , but the top level error printer already prepends find: {e}. The two sibling messages in the same function (the duplicate type and the missing separator ones) do not hardcode it, so this one is inconsistent. Drop the hardcoded prefix so the output matches GNU and the neighbors.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.29%. Comparing base (42ddfb1) to head (cdb59b2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #849   +/-   ##
=======================================
  Coverage   92.29%   92.29%           
=======================================
  Files          35       35           
  Lines        7445     7445           
  Branches      388      388           
=======================================
  Hits         6871     6871           
  Misses        433      433           
  Partials      141      141           

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[github-actions]

Commit cdb59b2 has test result changes:

bfs testsuite:

Test results comparison:
  Current:   TOTAL: 316 / PASSED: 273 / FAILED: 37 / SKIPPED: 6
  Reference: TOTAL: 317 / PASSED: 274 / FAILED: 37 / SKIPPED: 6

Changes from main branch:
  TOTAL: -1
  PASSED: -1
  FAILED: +0

No result in this run (1) - hung, crashed, or renamed:
  ? posix/depth_error (was PASS)

[codspeed-hq]

Merging this PR will not alter performance

✅ 20 untouched benchmarks

---

_{Comparing AlejandroCoronadoN:type-list-double-prefix (cdb59b2) with main (42ddfb1)}

[cakebaker]

Thanks!