50-dracut: synchronize option reading code with 51-dracut.install

initrd= option should also be dropped here. There is not reason
for the code to be different in the two places.

50-dracut.install

@@ -36,7 +36,13 @@ case "$COMMAND" in
         elif [[ -f /usr/lib/kernel/cmdline ]]; then
             read -r -d '' -a BOOT_OPTIONS < /usr/lib/kernel/cmdline
         else
-            read -r -d '' -a BOOT_OPTIONS < /proc/cmdline
+            declare -a BOOT_OPTIONS
+
+            read -r -d '' -a line < /proc/cmdline
+            for i in "${line[@]}"; do
+                [[ "${i#initrd=*}" != "$i" ]] && continue
+                BOOT_OPTIONS+=("$i")
+            done
         fi
 
         unset noimageifnotneeded

51-dracut-rescue.install

@@ -48,6 +48,8 @@ if [[ -f /etc/kernel/cmdline ]]; then
 elif [[ -f /usr/lib/kernel/cmdline ]]; then
     read -r -d '' -a BOOT_OPTIONS < /usr/lib/kernel/cmdline
 else
+    declare -a BOOT_OPTIONS
+
     read -r -d '' -a line < /proc/cmdline
     for i in "${line[@]}"; do
         [[ "${i#initrd=*}" != "$i" ]] && continue