zenfone9: Remove quotes in TARGET_RECOVERY_PIXEL_FORMAT

Change-Id: Ic400a47f0b4b8d2884082b99df3fe2e09c9438f6
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 0a10f5f..b3ac52e 100755
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -214,7 +214,7 @@
 TARGET_USERIMAGES_USE_EXT4 := true
 TARGET_USERIMAGES_USE_F2FS := true
 TARGET_RECOVERY_FSTAB := $(DEVICE_PATH)/ramdisk/fstab.qcom
-TARGET_RECOVERY_PIXEL_FORMAT := "RGBX_8888"
+TARGET_RECOVERY_PIXEL_FORMAT := RGBX_8888
 TARGET_RECOVERY_UI_MARGIN_HEIGHT := 150
 BOARD_USES_FULL_RECOVERY_IMAGE := true