motion: fix config file location

Install the motion.config file were the program expects it to be. From
the motion source code:

snprintf(filename, PATH_MAX, "%s/motion/motion.conf", sysconfdir);

Signed-off-by: Christopher McCrory <chrismcc@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/motion/motion.mk

@@ -59,7 +59,7 @@ endif
 # directories: docs, examples and init scripts
 define MOTION_INSTALL_TARGET_CMDS
 	$(INSTALL) -D -m 0644 $(@D)/motion-dist.conf \
-		$(TARGET_DIR)/etc/motion.conf
+		$(TARGET_DIR)/etc/motion/motion.conf
 	$(INSTALL) -D -m 0755 $(@D)/motion $(TARGET_DIR)/usr/bin/motion
 endef