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Tracks: tighten up a small loophole in completion checking.

If you had a single connected path linking the source to the
destination but _also_ had a spurious edge elsewhere in the grid, then
the spurious edge would be highlighted as an error, but it wouldn't
inhibit declaring the game complete and showing the victory flash.

--- a/tracks.c

+++ b/tracks.c

@@ -1646,8 +1646,10 @@

             for (i = 0; i < w*h; i++) {

                 if ((dsf_canonify(dsf, i) != pathclass) &&

                     ((state->sflags[i] & S_TRACK) ||

-                     (S_E_COUNT(state, i%w, i/w, E_TRACK) > 0)))

+                     (S_E_COUNT(state, i%w, i/w, E_TRACK) > 0))) {

+                    ret = FALSE;

                     state->sflags[i] |= S_ERROR;

+                }

             }

         }

     }