Swapped arguments to well_conn_alloc in well_conn_alloc_wellhead

[eivindjahren]

In well_conn_alloc_wellhead(), the arguments to well_conn_alloc() are swapped: open is cast to the direction enum and well_conn_dirZ is passed where the open boolean should be. This will set an incorrect direction for the wellhead connection (and always treat it as open).

Also in well_conn_alloc_wellhead(), the arguments to well_conn_alloc_fracture() are swapped (same issue as the matrix_connection branch): open is being cast to the direction enum and well_conn_dirZ is passed as the open boolean.

[eivindjahren]

This should resolve these warnings:

/home/runner/work/resdata/resdata/lib/resdata/well_conn.cpp: In function ‘well_conn_type* well_conn_alloc_wellhead(const rd_kw_type*, const RSTHead&, int)’:
/home/runner/work/resdata/resdata/lib/resdata/well_conn.cpp:279:62: warning: enum constant in boolean context [-Wint-in-bool-context]
  279 |                                    (well_conn_dir_enum)open, well_conn_dirZ,
      |                                                              ^~~~~~~~~~~~~~
/home/runner/work/resdata/resdata/lib/resdata/well_conn.cpp:284:43: warning: enum constant in boolean context [-Wint-in-bool-context]
  284 |                 (well_conn_dir_enum)open, well_conn_dirZ, header.unit_system);