Stopped adapting DecimalField values to strings on Oracle.
Stopped adapting DecimalField values to strings on Oracle.

cx_Oracle handles decimal.Decimal.

expressions_case.tests.CaseExpressionTests.test_update_decimal fails without
this change.

Follow up to 9c5c9bd7091b60fdccc405890dc4f44a8010e954.
wkschwartz/django,elena/django,shaib/django,django/django,koordinates/django,freakboy3742/django,apollo13/django,felixxm/django,adamchainz/django,blighj/django,manhhomienbienthuy/django,solarissmoke/django,monetate/django,adamchainz/django,ghickman/django,manhhomienbienthuy/django,MarkusH/django,monetate/django,atul-bhouraskar/django,wkschwartz/django,apollo13/django,elena/django,dsanders11/django,blighj/django,koordinates/django,atul-bhouraskar/django,solarissmoke/django,ghickman/django,auvipy/django,blighj/django,solarissmoke/django,dsanders11/django,freakboy3742/django,apollo13/django,takis/django,dsanders11/django,adamchainz/django,rsalmaso/django,dsanders11/django,shaib/django,googleinterns/django,shaib/django,monetate/django,adamchainz/django,elena/django,felixxm/django,django/django,koordinates/django,auvipy/django,apollo13/django,pauloxnet/django,takis/django,atul-bhouraskar/django,freakboy3742/django,takis/django,wkschwartz/django,MarkusH/django,elena/django,googleinterns/django,rsalmaso/django,django/django,pauloxnet/django,manhhomienbienthuy/django,felixxm/django,ghickman/django,solarissmoke/django,pauloxnet/django,rsalmaso/django,takis/django,MarkusH/django,monetate/django,googleinterns/django,felixxm/django,ghickman/django,wkschwartz/django,atul-bhouraskar/django,pauloxnet/django,MarkusH/django,koordinates/django,shaib/django,rsalmaso/django,django/django,googleinterns/django,auvipy/django,manhhomienbienthuy/django,auvipy/django,blighj/django