udev: *add* the fuzz-to-zero program to the udev RUN list, don't overwrite

For historical reasons, the keyboard builtin that sets the EVDEV_ABS values is
added as RUN. When we add our own fuzz-to-zero tool we must use +=, just using
an equals overwrites the existing RUN list.

The same is true for the IMPORT command we use to extract the fuzz to begin
with.

Fixes #424Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

udev/90-libinput-fuzz-override.rules.in

@@ -15,13 +15,13 @@ KERNEL!="event*", GOTO="libinput_fuzz_override_end"
 # about that.
 ATTRS{capabilities/abs}!="0", \
 	ENV{ID_INPUT_TOUCHPAD}=="1", \
-	IMPORT{program}="@UDEV_TEST_PATH@libinput-fuzz-extract %S%p", \
-	RUN{program}="@UDEV_TEST_PATH@libinput-fuzz-to-zero %S%p", \
+	IMPORT{program}+="@UDEV_TEST_PATH@libinput-fuzz-extract %S%p", \
+	RUN{program}+="@UDEV_TEST_PATH@libinput-fuzz-to-zero %S%p", \
 	GOTO="libinput_fuzz_override_end"
 ATTRS{capabilities/abs}!="0", \
 	ENV{ID_INPUT_TOUCHSCREEN}=="1", \
-	IMPORT{program}="@UDEV_TEST_PATH@libinput-fuzz-extract %S%p", \
-	RUN{program}="@UDEV_TEST_PATH@libinput-fuzz-to-zero %S%p", \
+	IMPORT{program}+="@UDEV_TEST_PATH@libinput-fuzz-extract %S%p", \
+	RUN{program}+="@UDEV_TEST_PATH@libinput-fuzz-to-zero %S%p", \
 	GOTO="libinput_fuzz_override_end"
 
 LABEL="libinput_fuzz_override_end"