Fix handling of backspace at beginning of line.

In the big boolification commit (3214563d8) I accidentally rewrote
"term->wrap == 0" as "term->wrap" instead of as "!term->wrap", so now
sending the backspace character to the terminal at the start of a line
causes the cursor to wrap round to the end of the previous line if and
only if it _shouldn't_ have done.

terminal.c

@@ -3185,7 +3185,7 @@ static void term_out(Terminal *term)
 		}
 		break;
 	      case '\b':	      /* BS: Back space */
-		if (term->curs.x == 0 && (term->curs.y == 0 || term->wrap))
+		if (term->curs.x == 0 && (term->curs.y == 0 || !term->wrap))
 		    /* do nothing */ ;
 		else if (term->curs.x == 0 && term->curs.y > 0)
 		    term->curs.x = term->cols - 1, term->curs.y--;