code128: Avoid extraneous CodeC switch

Avoid extraneous CodeC switch (with immediate switch back to CodeA/B) by re-checking digit runlength >= 4 after enca/encb push Also simplify `numsscr` to return only `nums` as `nchars` unused (cf codablockf and code16k which similarly could be simplified)
bwipp · Sep 3, 2024 · 50f6944 · 50f6944
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diff --git a/src/code128.ps b/src/code128.ps
diff --git a/tests/ps_tests/code128.ps b/tests/ps_tests/code128.ps
diff --git a/tests/ps_tests/gs1-128.ps b/tests/ps_tests/gs1-128.ps