Bluetooth: OTS: Use proper kconfig log option

`OTS_CLIENT=y` and `OTS=n` is a valid config.

Since the logs weren't conditionally included, this flew under the radar
for a while.

Signed-off-by: Jonathan Rico <[email protected]>

Author: jori-nordic

subsys/bluetooth/services/ots/ots_l2cap.c

@@ -25,7 +25,7 @@
 #if defined(CONFIG_BT_OTS)
 LOG_MODULE_DECLARE(bt_ots, CONFIG_BT_OTS_LOG_LEVEL);
 #elif defined(CONFIG_BT_OTS_CLIENT)
-LOG_MODULE_REGISTER(bt_ots, CONFIG_BT_OTS_LOG_LEVEL);
+LOG_MODULE_REGISTER(bt_ots, CONFIG_BT_OTS_CLIENT_LOG_LEVEL);
 #endif
 
 /* According to BLE specification Assigned Numbers that are used in the