pretty: find pretty formats case-insensitively

User-defined pretty formats are stored in config, which is meant to use
case-insensitive matching for names as noted in config.txt's 'Syntax'
section:

    All the other lines [...] are recognized as setting variables, in
    the form 'name = value' [...]. The variable names are
    case-insensitive, [...].

When a user specifies one of their format aliases with an uppercase in
it, however, it is not found.

    $ git config pretty.testAlias %h
    $ git config --list | grep pretty
    pretty.testalias=%h
    $ git log --format=testAlias -1
    fatal: invalid --pretty format: testAlias
    $ git log --format=testalias -1
    3c2a3fdc38

This is true whether the name in the config file uses any uppercase
characters or not.

Use case-insensitive comparisons when identifying format aliases.

Co-authored-by: Jeff King <peff@peff.net>
Signed-off-by: Brian Lyles <brianmlyles@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

pretty.c

@@ -140,7 +140,7 @@ static struct cmt_fmt_map *find_commit_format_recursive(const char *sought,
 	for (i = 0; i < commit_formats_len; i++) {
 		size_t match_len;
 
-		if (!starts_with(commit_formats[i].name, sought))
+		if (!istarts_with(commit_formats[i].name, sought))
 			continue;
 
 		match_len = strlen(commit_formats[i].name);