meta-ohos: Remove redundant install list from local.conf.sample

Remove redundant IMAGE_INSTALL_append from local.conf.sample.
openharmony-image-base and openharmony-image-extra images
will include those packages.

Signed-off-by: Zbigniew Bodek <zbigniew.bodek@huawei.com>

flavours/linux/local.conf.sample

@@ -258,5 +258,4 @@ PACKAGECONFIG_append_pn-qemu-system-native = " sdl"
 # this doesn't mean anything to you.
 CONF_VERSION = "1"
 
-IMAGE_INSTALL_append = " dhcp-client dropbear packagegroup-base-wifi iw bluez5 obexftp"
 IMAGE_INSTALL_append_stm32mp1-av96 = " av96-root-files"