Moved pdlp_iteration_count back to where it was inserted, breaking the C API #2789

Job	Run time
debug (ubuntu-latest)	3m 28s
debug_all_tests (ubuntu-latest)	3m 14s
release (ubuntu-latest)	3m 14s
release_all_tests (ubuntu-latest)	3m 32s
debug64 (ubuntu-latest)	3m 24s
debug64_all_tests (ubuntu-latest)	3m 24s
Release64 (ubuntu-latest)	3m 13s
Release64_all_tests (ubuntu-latest)	3m 15s
	26m 44s

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