psplash: Fix override syntax

Include a minor formatting change for SRC_URI.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-oniro-core/recipes-core/psplash/psplash_%.bbappend

@@ -2,13 +2,14 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-FILESEXTRAPATHS_prepend := "${ONIRO_COREBASE}/assets:"
-SPLASH_IMAGES_append = " file://psplash-oniro-img.png;outsuffix=oniro"
+FILESEXTRAPATHS:prepend := "${ONIRO_COREBASE}/assets:"
+SPLASH_IMAGES:append = " file://psplash-oniro-img.png;outsuffix=oniro"
 ALTERNATIVE_PRIORITY_psplash-oniro[psplash] = "200"
 
 EXTRA_OECONF += "--enable-img-fullscreen --disable-startup-msg --disable-progress-bar"
 
 # Change background color and splash image with no progress bar
-FILESEXTRAPATHS_prepend := "${THISDIR}/psplash:"
-SRC_URI += "file://0001-psplash-colors.h-color-change.patch \
-            "
+FILESEXTRAPATHS:prepend := "${THISDIR}/psplash:"
+SRC_URI += " \
+    file://0001-psplash-colors.h-color-change.patch \
+    "