networkmanager; remove bbappend

If I rmember correctly first versions of KDE/KF5 did nit build properly if
networkmanager was not build with modemmanager support. These days this
is no more required so skip the append (particularly after causing trouble
with meta-networking networkmanager patches: PACKAGECONFIG was incorrect in
recipe but due to override here remained unnoticed).

Signed-off-by: Andreas Müller <schnitzeltony@gmail.com>

extends-meta-oe/networkmanager_%.bbappend

@@ -1,6 +0,0 @@
-PACKAGECONFIG ?= "nss ifupdown netconfig dhclient dnsmasq \
-    ${@bb.utils.contains('DISTRO_FEATURES','systemd','systemd','consolekit',d)} \
-    wifi \
-    bluez5 \
-    modemmanager \
-"