settings.conf: validate settings with kwalify

settings.conf

@@ -58,39 +58,39 @@ instances:
 # instances are lifted.
 # YAML: list of lists of strings.
 sequence:
-- show:
-  - welcome
-  - locale
-  - keyboard
-  - partition
-  - users
-  - summary
-- exec:
-  - partition
-  - mount
-  - unpackfs
-  - machineid
-  - fstab
-  - locale
-  - keyboard
-  - localecfg
-  - luksopenswaphookcfg
-  - luksbootkeyfile
-  - plymouthcfg
-  - initcpiocfg
-  - initcpio
-  - users
-  - displaymanager
-  - mhwdcfg
-  - networkcfg
-  - hwclock
-  - services
-  - grubcfg
-  - bootloader
-  - postcfg
-  - umount
-- show:
-  - finished
+    - show:
+        - welcome
+        - locale
+        - keyboard
+        - partition
+        - users
+        - summary
+    - exec:
+        - partition
+        - mount
+        - unpackfs
+        - machineid
+        - fstab
+        - locale
+        - keyboard
+        - localecfg
+        - luksopenswaphookcfg
+        - luksbootkeyfile
+        - plymouthcfg
+        - initcpiocfg
+        - initcpio
+        - users
+        - displaymanager
+        - mhwdcfg
+        - networkcfg
+        - hwclock
+        - services
+        - grubcfg
+        - bootloader
+        - postcfg
+        - umount
+    - show:
+        - finished
 
 # A branding component is a directory, either in SHARE/calamares/branding or in
 # /etc/calamares/branding (the latter takes precedence). The directory must contain a