RFPL-3325: Remove binding for tables sorting examples

- as beans are now SessionScoped, it is a bug to use component binding
- removed component binding in the examples where it was redundant
- so in: sorting example for ExtendedDataTable, DataTable,
  CollapsibleSubTable

Conflicts:
	metamer/application/src/main/java/org/richfaces/tests/metamer/ColumnSortingMap.java
	metamer/application/src/main/java/org/richfaces/tests/metamer/bean/rich/RichDataTableBean.java
	metamer/application/src/main/java/org/richfaces/tests/metamer/bean/rich/RichExtendedDataTableBean.java