Frederik Schulz
ad76ac798e
* Removes unnecessary blank impl for Backend
This commit removes a from my perspective unneccessary implementation
for &T which implement Backend.
The current implementation exists (again from my perspective) solely
to satisfy a methods &mut self parameters (i.e. allows to satisfy
this for an & reference via using &mut &Backend).
As all implementors use a RefCell with borrow_mut() where actually
calling the mentioned &mut self method and then forwad to the
{} implementation of either TrieBackend or ProvingBackend, the
current &mut self seems to be not needed.
* Fixed tests client
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