do not use literals in conditional statements

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

src/main/java/com/owncloud/android/providers/FileContentProvider.java

@@ -482,7 +482,7 @@ public class FileContentProvider extends ContentProvider {
             case ROOT_DIRECTORY:
                 break;
             case DIRECTORY:
-                if (uri.getPathSegments().size() > 1) {
+                if (uri.getPathSegments().size() > SINGLE_PATH_SEGMENT) {
                     sqlQuery.appendWhere(ProviderTableMeta.FILE_PARENT + "=" + uri.getPathSegments().get(1));
                 }
                 break;