.xml extension must be lower case

[steve6375]

.XML files are not listed, .xml must be lower case.

[a1ive]

grub2-filemanager/boot/grubfm/distro/win.sh

Line 44 in 918524d

if [ -f "(${grubfm_device})${grubfm_dir}"*.xml ];

I used wildcards to match xml files, which are case-sensitive.

https://github.com/a1ive/grub/blob/5b20b2f521f32e8b170581854cc7c80f0c0bc159/grub-core/commands/wildcard.c#L180
According to https://man7.org/linux/man-pages/man3/regcomp.3.html,
if (regcomp (regexp, buffer, RE_SYNTAX_GNU_AWK)) should be if (regcomp (regexp, buffer, RE_SYNTAX_GNU_AWK | REG_ICASE))