Fix renaming non DataJoint attributes using proj

[A-Baji]

This is an issue reported by @kabilar in our internal slack.

Hi Raphael dimitri, question regarding the proj operator functionality for invalid attribute names in DataJoint version < 0.13 and > 0.13. Have also discussed with Jeroen Verswijver.
Currently performing a database migration for Princeton and working with attribute names that are of an invalid format (i.e. capitalized). In DataJoint 0.12.9, was able to use proj to rename invalid attribute names, but in DataJoint 0.13.2 the same functionality does not occur. Is this expected for DataJoint > 0.13? If not, I can file an issue on GitHub to be addressed in a future release. The current workaround is to do the migration in 0.12.9.
Thank you.
DataJoint 0.12.9

test_proj = dj.create_virtual_module('test_projection', 'test_projection')

test_proj.TableA()
*oldID
+-------+

test_proj.TableA.proj(new_id='oldID')
*new_id
+--------+
DataJoint 0.13.2
test_proj = dj.create_virtual_module('test_projection', 'test_projection')

test_proj.TableA()
*oldID
+-------+

test_proj.TableA.proj(new_id='oldID')
*oldID new_id
+-------+ +--------+