initrd.defaults: don't use backticks

defaults/initrd.defaults

@@ -44,9 +44,9 @@ WHITE=""
 # Just go to the top of the screen
 # echo -n ""
 
-KV=`uname -r`
+KV=$(uname -r)
-KMAJOR=`echo $KV | cut -f1 -d.`
+KMAJOR=$(echo $KV | cut -f1 -d.)
-KMINOR=`echo $KV | cut -f2 -d.`
+KMINOR=$(echo $KV | cut -f2 -d.)
 KVER="${KMAJOR}.${KMINOR}"
 MISCOPTS='debug detect'
 
@@ -66,6 +66,7 @@ PLYMOUTHD_BIN='/sbin/plymouthd'
 
 PLYMOUTH_BIN='/bin/plymouth'
 [ ! -e "${PLYMOUTH_BIN}" ] && PLYMOUTH_BIN='/usr/bin/plymouth'
+
 REAL_ROOT=''
 CONSOLE='/dev/console'
 NEW_ROOT='/newroot'