PrefService: do not limit lists to 1000 items

There was no reason for that hard-coded (and silent) limit.

Author: ctrueden

src/main/java/org/scijava/prefs/DefaultPrefService.java

@@ -470,7 +470,7 @@ public void putList(final List<String> list) {
 
 		public List<String> getList() {
 			final List<String> list = new ArrayList<>();
-			for (int index = 0; index < 1000; index++) {
+			for (int index = 0; index < Integer.MAX_VALUE; index++) {
 				final String value = get("" + index);
 				if (value == null) {
 					break;