meta-q71l: quanta-powerctrl: Fix build

e.g.
install: cannot stat '/home/peter/openbmc/build/quanta-q71l/tmp/work/armv5e-openbmc-linux-gnueabi/quanta-powerctrl/1.0-r0init_once.sh': No such file or directory

Signed-off-by: Peter Foley <pefoley@google.com>
Change-Id: I40ff36dd1b640c5410c79fbd91642f658d9cc2b7
diff --git a/meta-quanta/meta-q71l/recipes-phosphor/quanta-powerctrl/quanta-powerctrl.bb b/meta-quanta/meta-q71l/recipes-phosphor/quanta-powerctrl/quanta-powerctrl.bb
index a540355..df3bc74 100644
--- a/meta-quanta/meta-q71l/recipes-phosphor/quanta-powerctrl/quanta-powerctrl.bb
+++ b/meta-quanta/meta-q71l/recipes-phosphor/quanta-powerctrl/quanta-powerctrl.bb
@@ -22,7 +22,7 @@
 
 do_install() {
     install -d ${D}/${bindir}
-    install -m 0755 ${S}init_once.sh ${D}/${bindir}/
-    install -m 0755 ${S}poweroff.sh ${D}/${bindir}/
-    install -m 0755 ${S}poweron.sh ${D}/${bindir}/
+    install -m 0755 ${S}/init_once.sh ${D}/${bindir}/
+    install -m 0755 ${S}/poweroff.sh ${D}/${bindir}/
+    install -m 0755 ${S}/poweron.sh ${D}/${bindir}/
 }