Revert "Refactor grub-install command in build_iso function for improved clarity and maintainability"

This reverts commit c0067db.

Author: Anduin2017

src/build.sh

@@ -257,14 +257,7 @@ EOF
         sudo mkfs.vfat efiboot.img && \
         mkdir efi && \
         sudo mount efiboot.img efi && \
-        sudo grub-install \
-            --target=x86_64-efi \
-            --boot-directory=efi/boot \
-            --efi-directory=efi \
-            --uefi-secure-boot \
-            --removable \
-            --no-nvram \
-            --bootloader-id=GRUB && \
+        sudo grub-install --efi-directory=efi --uefi-secure-boot --removable --no-nvram && \
         sudo umount efi && \
         rm -rf efi
     )