Remove legacy_mode clause for checking ImageJ.cfg

This seemed like a good idea before there was an existence check for the
Java specified in ImageJ.cfg. Now that we have that check, the legacy
mode requirement was overly conservative and potentially confusing.

src/main/c/config.c

@@ -51,7 +51,7 @@ void parse_legacy_config(struct string *jvm_options)
 
 		debug("ImageJ.cfg:%d: %.*s", line, (int)(eol - p), p);
 
-		if (line == 2 && legacy_mode) {
+		if (line == 2) {
 			int jre_len = -1;
 #ifdef WIN32
 			if (!suffixcmp(p, eol - p, "\\bin\\javaw.exe"))