fixed 'update node registration' get/parse body bytes

[iltoga]

Description

fixes new and update registration process by adding new tx type to transaction.go and removing registration height from (new) node registration tx body

Breakdown

• Recompiled Updated schema: removed registration height field from (new) noderegistration tx body
• Added tx type 2,1 (update node registration) to transaction.go and added unit test for it
• Fixed new and update node registration get/parse body bytes and fixed/implemented new tests

Reference Issue

Close #84