Remove unexisting name from plan data for Synchronizes a plan action

[andressspinetti]

What's this PR do?

Remove name from dict used for synchronize a plan.

Any background context you want to provide?

Plan object does not come with name property and makes the plan signals to fail. More information in Stripe Docs: https://stripe.com/docs/api/plans#plan_object

What ticket or issue # does this fix?

Closes #[issue number]

Definition of Done (check if considered and/or addressed):

• [x] Are all backwards incompatible changes documented in this PR?
• [x] Have all new dependencies been documented in this PR?
• [x] Has the appropriate documentation been updated (if applicable)?
• [x] Have you written tests to prove this change works (if applicable)?

[codecov[bot]]

Codecov Report

Merging #625 into master will increase coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #625      +/-   ##
==========================================
+ Coverage   99.21%   99.21%   +<.01%     
==========================================
  Files          33       33              
  Lines        1911     1913       +2     
  Branches      175      176       +1     
==========================================
+ Hits         1896     1898       +2     
  Misses          7        7              
  Partials        8        8

Flag	Coverage Δ
#py27dj110	98.9% <100%> (ø)	:arrow_up:
#py27dj111	98.9% <100%> (ø)	:arrow_up:
#py27dj18	99.16% <100%> (ø)	:arrow_up:
#py34dj110	98.9% <100%> (ø)	:arrow_up:
#py34dj111	98.9% <100%> (ø)	:arrow_up:
#py34dj18	99.16% <100%> (ø)	:arrow_up:
#py34dj20	98.9% <100%> (ø)	:arrow_up:
#py35dj110	98.9% <100%> (ø)	:arrow_up:
#py35dj111	98.9% <100%> (ø)	:arrow_up:
#py35dj18	99.16% <100%> (ø)	:arrow_up:
#py35dj20	98.9% <100%> (ø)	:arrow_up:
#py36dj111	98.9% <100%> (ø)	:arrow_up:
#py36dj20	98.9% <100%> (ø)	:arrow_up:
#py36dj20psql	98.9% <100%> (ø)	:arrow_up:

Impacted Files	Coverage Δ
pinax/stripe/actions/plans.py	100% <100%> (ø)	:arrow_up:
pinax/stripe/models.py	100% <100%> (ø)	:arrow_up:

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