esxi: fix #5587: add support for older version of vmx storage filepaths

Allow the ESXi storage disk entry property "fileName" to be flatcased
("filename") in addition to being camelcased ("fileName"). This adds
compatibility with older ESXi .vmx configuration files.

Signed-off-by: Daniel Kral <d.kral@proxmox.com>

src/PVE/Storage/ESXiPlugin.pm

@@ -754,7 +754,7 @@ sub manifest { $_[0]->{'pve.manifest'} }
 # (Also used for the fileName config key...)
 sub is_disk_entry : prototype($) {
     my ($id) = @_;
-    if ($id =~ /^(scsi|ide|sata|nvme)(\d+:\d+)(:?\.fileName)?$/) {
+    if ($id =~ /^(scsi|ide|sata|nvme)(\d+:\d+)(:?\.file[nN]ame)?$/) {
 	return ($1, $2);
     }
     return;