Removing assertion that does not hold under all scenarios.

When we save gamestate as part of making an insurance snapshot, we will
save message history which will clear toplines but leaving window state
in tack including the need for more.

win/tty/topl.c

@@ -259,7 +259,6 @@ register const char *bp;
         && cw->cury == 0
         && n0 + (int) strlen(g.toplines) + 3 < CO - 8 /* room for --More-- */
         && (notdied = strncmp(bp, "You die", 7)) != 0) {
-        nhassert(strlen(g.toplines) == cw->curx);
         Strcat(g.toplines, "  ");
         Strcat(g.toplines, bp);
         cw->curx += 2;