Remove line break between <label> and <caption> text in figure display

Describe the bug
MIJ editors have requested that we remove the line break between the text (usually "Figure #" or similar) and the text.

Janeway version
The version of Janeway under which the bug has been reproduced.
If running off of master, please, indicate the current HEAD of the Janeway installation

To Reproduce
Steps to reproduce the behavior:

1. Go to https://journals.publishing.umich.edu/mij/plugins/typesetting/preview_galley/article/93/galley/51/
2. Scroll down to Figure 1 (see also screenshot below)
3. Here's the JATS tagging for this figure:
   `
   Figure 1:

Mission statement excerpts of digital rights advocacy organizations, 2019–2020.

These excerpts were pulled from the organizations’ websites.

Expected behavior
Instead of a line break, I think it would make sense to just insert a single space between the text of these fields.

Reproduce the figure display at the linked preview URL and inspect the rendering entry point for JATS and content. Confirm that the rendered Figure 1 label and caption have one separating space rather than a line break, and verify the result with the relevant display checks.