Sanitize PLYMOUTH_THEME variable

Fixes #262

Author: picodotdev

alis.conf

@@ -142,7 +142,7 @@ HOOKS="base !udev !usr !resume !systemd !btrfs autodetect microcode modconf kms
 MODULES="!vmd !tpm"
 UKI="false"
 PLYMOUTH="false"
-PLYMOUTH_THEME="auto !bgtr !fade-in !glow !script !solar !spinner !spinfinity !tribar !text !details"  # (single, auto=default)
+PLYMOUTH_THEME="auto !bgtr !fade-in !glow !script !solar !spinner !spinfinity !tribar !text !details" # (single, auto=default)
 
 # bootloader
 ## BOOTLOADER system boot loader.

alis.sh

@@ -72,6 +72,7 @@ function sanitize_variables() {
     SYSTEMD_HOMED_STORAGE=$(sanitize_variable "$SYSTEMD_HOMED_STORAGE")
     SYSTEMD_HOMED_STORAGE_LUKS_TYPE=$(sanitize_variable "$SYSTEMD_HOMED_STORAGE_LUKS_TYPE")
     BOOTLOADER=$(sanitize_variable "$BOOTLOADER")
+    PLYMOUTH_THEME=$(sanitize_variable "$PLYMOUTH_THEME")
     CUSTOM_SHELL=$(sanitize_variable "$CUSTOM_SHELL")
     DESKTOP_ENVIRONMENT=$(sanitize_variable "$DESKTOP_ENVIRONMENT")
     DISPLAY_MANAGER=$(sanitize_variable "$DISPLAY_MANAGER")