fiesta: Add missing file and fixed .gitignore

fiesta's .gitignore classified all PDFs as files that shouldn't be
tracked, with the intention of ignoring compiled LaTeX files. However,
some resources used by the LaTeX source files are actually PDF files
too, so those were ignored. This has been fixed.

Change-Id: I85b7642cec319ef5f4b89da4e88d617f8ccb8283
diff --git a/quad8/fiesta/.gitignore b/quad8/fiesta/.gitignore
index a136337..f0de8a3 100644
--- a/quad8/fiesta/.gitignore
+++ b/quad8/fiesta/.gitignore
@@ -1 +1 @@
-*.pdf
+main.pdf