BaseClasses: CoreDataPage: Fix functional call

getDataPageNumber was calling getData which behaves very differently between RX and TX, the naming is poor but lets work around it

Author: cujomalainey

src/BaseClasses/ANTPLUS_CoreDataPage.cpp

@@ -11,7 +11,7 @@ CoreDataPage<T>::CoreDataPage() : T() {
 template<class T>
 uint8_t CoreDataPage<T>::getDataPageNumber() {
  // TODO handle shared channels
- return this->getData(ANTPLUS_DEFAULT_DATAPAGE_BYTE);
+ return this->get8BitValue(ANTPLUS_DEFAULT_DATAPAGE_BYTE);
 }
 
 template<class T>