fix(installer): remove --recheck from grub-install to prevent device scan hang

--recheck triggers grub to rescan all block devices. On N100 mini-PCs with
eMMC + NVMe, scanning the eMMC causes grub-install to hang indefinitely.
Device maps are generated fresh on each install so --recheck is redundant.

cmd/installer/install/install.go

@@ -539,7 +539,6 @@ func installBootloader(disk string) error {
 		"--boot-directory="+bootDir,
 		"--bootloader-id=spinifex",
 		"--removable",
-		"--recheck",
 	)
 	if efiErr != nil {
 		slog.Warn("installBootloader: EFI install failed", "err", efiErr)
@@ -547,7 +546,6 @@ func installBootloader(disk string) error {
 	if biosErr := run("grub-install",
 		"--target=i386-pc",
 		"--boot-directory="+bootDir,
-		"--recheck",
 		disk,
 	); biosErr != nil {
 		if efiErr != nil {