filter: add page source to email filter

Since the email filter is called from lots of places, the script might
benefit from knowing the origin. That way it can modify its contents
and/or size depending.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
diff --git a/ui-commit.c b/ui-commit.c
index bd14ef0..c48bfe8 100644
--- a/ui-commit.c
+++ b/ui-commit.c
@@ -44,7 +44,7 @@
 	cgit_print_diff_ctrls();
 	html("<table summary='commit info' class='commit-info'>\n");
 	html("<tr><th>author</th><td>");
-	cgit_open_filter(ctx.repo->email_filter, info->author_email);
+	cgit_open_filter(ctx.repo->email_filter, info->author_email, "commit");
 	html_txt(info->author);
 	if (!ctx.cfg.noplainemail) {
 		html(" ");
@@ -55,7 +55,7 @@
 	cgit_print_date(info->author_date, FMT_LONGDATE, ctx.cfg.local_time);
 	html("</td></tr>\n");
 	html("<tr><th>committer</th><td>");
-	cgit_open_filter(ctx.repo->email_filter, info->committer_email);
+	cgit_open_filter(ctx.repo->email_filter, info->committer_email, "commit");
 	html_txt(info->committer);
 	if (!ctx.cfg.noplainemail) {
 		html(" ");