build: Update jscs config

Continue specifying our coding style more accurately, and keep
following upstream refactoring that fixes bugs. This release is
mainly about getting rid of the unstable "sticky" operator sniffer
which has been deprecated in favour of using other rules instead
that are able to enforce this more accurately.

* requireSpacesInConditionalExpression: Enable.
* disallowSpaceBeforeBinaryOperators: Enable for commas.
* requireSpaceBeforeBinaryOperators: Add assignment operator.
* requireSpaceAfterBinaryOperators: Add assignment operator.

* disallowLeftStickedOperators: Remove deprecated rule.
  - Ternary covered by requireSpacesInConditionalExpression.
  - Rest covered by requireSpace{Before,After}BinaryOperators.

* requireLeftStickedOperators: Remove deprecated rule.
  - Comma covered by disallowSpaceBeforeBinaryOperators.

* requireRightStickedOperators: Remove deprecated rule.
  - Logical not (!) covered by disallowSpaceAfterPrefixUnaryOperators.

Change-Id: I1e3c7c98eaf68ece9f915696af130b01a6e723a1