config: minor addition of whitespace

In general, binary operators should be enclosed in a pair of leading and
trailing space (SP) characters.  Thus, clean up one spotted expression that
for some reason had a "bunched up" operator.

Signed-off-by: Dragan Simic <dsimic@manjaro.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

config.c

@@ -871,7 +871,7 @@ static char *parse_value(struct config_source *cs)
 			continue;
 		}
 		if (c == '"') {
-			quote = 1-quote;
+			quote = 1 - quote;
 			continue;
 		}
 		strbuf_addch(&cs->value, c);