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Group: fix assertion failure in Unreasonable generation.

Generating the game id 6dui#12345 would cause an assertion failure in
a call to latin_solver_place that should never have happened in the
first place, because the "return -1" that ought to have prevented it
was accidentally inside #ifdef STANDALONE_SOLVER.

--- a/unfinished/group.c

+++ b/unfinished/group.c

@@ -404,8 +404,8 @@

                                    solver_recurse_depth*4, "",

                                    names[j-1], i, j);

                         }

-                        return -1;

 #endif

+                        return -1;

                     }

 #ifdef STANDALONE_SOLVER

                     if (solver_show_working) {

@@ -425,8 +425,8 @@

                                    solver_recurse_depth*4, "",

                                    names[j-1], j, i);

                         }

-                        return -1;

 #endif

+                        return -1;

                     }

 #ifdef STANDALONE_SOLVER

                     if (solver_show_working) {