Fix missing prefix for URL field

[nikstur]

It seems like an empty prefix is missing for the URL field.
The screenshot shows this missing space before "Available: "

The change seems to fix it. Please let me know if the solution is shortsighted.

[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:

ieee.csl (modified style; unchanged output for sample items)

[1], [2]
[3], [4]

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[1]B. Hancké, M. Rhodes, and M. Thatcher, Eds., Beyond varieties of capitalism: Conflict, contradiction, and complementarities in the European economy. Oxford and New York: Oxford University Press, 2007.
[2]“CSL search by example,” Citation Style Editor, 2012. http://editor.citationstyles.org/searchByExample/ (accessed Dec. 15, 2012).
[3]I. 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, P. A. Hall and D. Soskice, Eds. New York: Oxford University Press, 2001, pp. 184–213.
[4]M. Fenner et al., “A data citation roadmap for scholarly data repositories,” Sci. Data, vol. 6, no. 1, p. 28, Apr. 2019, doi: 10.1038/s41597-019-0031-8.

[adam3smith]

Looks good thanks. The prefix is there for all other cases in the macro