fix: remove duplicate DI registration of IClusterManagerAccessor

[gnjack]

Description

IClusterManagerAccessor is already registered as a singleton a few lines above.

Looks like this line was accidentally duplicated in https://github.com/Farfetch/kafkaflow/commit/3f996b61bd2850fbe7cd5893bae54b78521ae74c#diff-ad7219aa5db9d536244342b218fd6ef245e685445e173b747ef99513d520dbc4R52

The duplicate registration breaks our Ninject DI implementation:

Ninject.ActivationException : Error activating IConsumerManagerFactory
More than one matching bindings are available.
Matching bindings:
  1) binding from IConsumerManagerFactory to constant value
  2) binding from IConsumerManagerFactory to constant value
Activation path:
  1) Request for IConsumerManagerFactory

Suggestions:
  1) Ensure that you have defined a binding for IConsumerManagerFactory only once.

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have added tests to cover my changes
• [ ] I have made corresponding changes to the documentation

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