classic mbed: bugfix can loop test

bugfixing the can loop test which failed after PR #2504

Author: ohagendorf

libraries/tests/mbed/can_loopback/main.cpp

@@ -21,10 +21,9 @@ CAN can1(P5_9, P5_10);
       defined(TARGET_NUCLEO_F746ZG) || defined(TARGET_DISCO_L476VG)  || \
       defined(TARGET_NUCLEO_L476RG) || defined(TARGET_NUCLEO_L432KC)
 CAN can1(PA_11, PA_12);
-      defined(TARGET_NUCLEO_F446ZE) || \
-      defined(TARGET_NUCLEO_F103RB) || \
-      defined(TARGET_NUCLEO_F207ZG) || \
-      defined(TARGET_NUCLEO_F303ZE) || \
+#elif defined(TARGET_DISCO_F469NI)  || defined(TARGET_DISCO_F746NG)  || \
+      defined(TARGET_NUCLEO_F446ZE) || defined(TARGET_NUCLEO_F103RB) || \
+      defined(TARGET_NUCLEO_F207ZG) || defined(TARGET_NUCLEO_F303ZE) || \
       defined(TARGET_DISCO_F769NI)
 CAN can1(PB_8, PB_9);
 #endif