Improve backward compatibility in `groups_get_group()`.

[dcavins]

In r11090, we changed the signature of groups_get_group() to accept an integer (group_id) and added backcompat for the most commonly used former signature, an associative array. However, it was also possible to use a query string-style argument, because wp_parse_args() could handle that.

Patch forthcoming.

[dcavins]

Handle integers, arrays, and query string arguments.

[boonebgorges]

7302.1.patch​ has irregular indentation, but otherwise looks like a good approach.

[dcavins]

Fix spacing.

[DJPaul]

LGTM!

[dcavins]

In 11212:

Improve backward compatibility in groups_get_group().

In r11090, we changed the signature of groups_get_group() to accept
an integer and added backcompat for the most commonly used former
signature, an associative array. However, it was also possible to use a
query-string-style argument. This commit covers that case.

Fixes #7302 (for 2.7 branch).

[dcavins]

In 11213:

Improve backward compatibility in groups_get_group().

In r11090, we changed the signature of groups_get_group() to accept
an integer and added backcompat for the most commonly used former
signature, an associative array. However, it was also possible to use a
query-string-style argument. This commit covers that case.

Fixes #7302.