Fix setting fullname for ORCID

[hmpf]

Originally, fullname was set to response['person']['name'], which in ORCID is a large json object. Everywhere else, fullname is assumed to be a string. It cannot be used directly as a fullname but needs converting.

Proposed changes

The patch ensures that fullname is a string, in a similar way to how other backends do it.

Types of changes

Please check the type of change your PR introduces:

• [ ] Release (new release request)
• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Code style update (PEP8, lint, formatting, renaming, etc)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Build related changes (build process, tests runner, etc)
• [ ] Other (please describe):

Checklist

• [x] Lint and unit tests pass locally with my changes
• [ ] I have added tests that prove my fix is effective or that my feature works

(I had to install libxmlsec1-dev manually on debian in order to get tox to run.)

[codecov[bot]]

Codecov Report

Merging #666 (2846d5a) into master (17476e3) will increase coverage by 0.26%. The diff coverage is 75.79%.

@@            Coverage Diff             @@
##           master     #666      +/-   ##
==========================================
+ Coverage   76.70%   76.96%   +0.26%     
==========================================
  Files         317      317              
  Lines        9598     9646      +48     
  Branches      465     1033     +568     
==========================================
+ Hits         7362     7424      +62     
+ Misses       2084     2071      -13     
+ Partials      152      151       -1     

Flag	Coverage Δ
unittests	76.96% <75.79%> (+0.26%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
social_core/backends/apple.py	69.13% <0.00%> (ø)
social_core/backends/asana.py	86.95% <ø> (ø)
social_core/backends/atlassian.py	100.00% <ø> (ø)
social_core/backends/azuread_tenant.py	0.00% <0.00%> (ø)
social_core/backends/battlenet.py	0.00% <ø> (ø)
social_core/backends/beats.py	0.00% <ø> (ø)
social_core/backends/cilogon.py	90.47% <ø> (ø)
social_core/backends/coding.py	0.00% <ø> (ø)
social_core/backends/discord.py	0.00% <0.00%> (ø)
social_core/backends/douban.py	0.00% <0.00%> (ø)
... and 146 more

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