Refactor theno_backend to shorten linelength (#11391)

* Refactor theno_backend to shorten linelength

A variety of different changes to ensure linelength falls within 85 charicter
linelength

Part of issue #11383

* Fixup Syntax in Theano Backend

Syntax fixes for incorrect line breaks.

* Fixup Linter Warnings

* Attempt to Fix Failing CTC Cost Tests

Change the ctc cost function to try and make the `test_ctc` pass again.

* fixed shaddowig of log_probs

* Fix up bad closing brackets

* Extract Variables dont' Wrap Lines

Update some of the refactorings to get line lengths under control by
extracting sub-expressions to their own variables ratther than
wrapping long lines. This should hopefully make things a little easier
to read.

* Fixup Broken For Loop

* Fix Mixup with `add` and `append`

Python lists `append` not `add` :-/