Mixing StringBuilder and String concatenation in FinderMetadata.java

In addon-finder/src/main/java/org/springframework/roo/addon/finder/FinderMetadata.java line 308 the StringBuilder should be used instead of String concatenation.

This results in source code that can not be compiled every time Spring Roo updates the finder aspects.

Line should be

bodyBuilder.appendFormalLine("queryBuilder.append(\" ORDER BY \").append( sortFieldName");");