Remove erroneous "by" for subsequent in bluebook-law-review.csl

[POBrien333]

https://forums.zotero.org/discussion/116905/cross-references-in-bluebook-format-coming-out-with-a-superfluous-by#latest

Nota bene, there is another PR open for bluebook> #6634

[github-actions]

Awesome! You just created a pull request to the Citation Styles Language styles repository. One of our human volunteers will try to get in touch soon (usually within a week). In the meantime, I will run some automated checks. You should be notified of the results in a few minutes.

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[github-actions]

😃 Your submission passed all our automated tests.

Below are some sample citations generated based on your proposed changes:

bluebook-law-review.csl (modified style; unchanged output for sample items)

Beyond varieties of capitalism: Conflict, contradiction, and complementarities in the European economy, (Bob Hancké, Martin Rhodes, & Mark Thatcher eds., 2007); CSL search by example, Citation Style Editor (2012), http://editor.citationstyles.org/searchByExample/ (last visited Dec 15, 2012).
Isabela Mares, Firms and the Welfare State: When, Why, and How Does Social Policy Matter to Employers?, in Varieties of capitalism. The institutional foundations of comparative advantage 184 (Peter A. Hall & David Soskice eds., 2001); Martin Fenner et al., A Data Citation Roadmap for Scholarly Data Repositories, 6 Sci. Data 28 (2019), http://www.nature.com/articles/s41597-019-0031-8 (last visited Apr 27, 2019).