Fix \autoref case for 'figure'

Only affects 3 recently introduced occurrences of references to figures.

preamble.tex

@@ -37,6 +37,7 @@
 %\usepackage{t1enc}
 \usepackage{graphicx}
 \graphicspath{{media/}{../media/}} % so that chapter files can also find the images
+\def\figureautorefname{figure} % Use lower case initial, just like for sections.
 
 \usepackage{verbatim}
 % The fixltx2e that was used for textsubscript is no longer needed for pdf, but is needed by latexml