Use open drain for USB pull-up control in Olimex STM32-H103

Author: jeanthom

src/stm32f103/olimexstm32h103/config.h

@@ -78,7 +78,7 @@
 #define USB_PULLUP_ACTIVE_HIGH 0
 #endif
 #ifndef USB_PULLUP_OPEN_DRAIN
-#define USB_PULLUP_OPEN_DRAIN 0
+#define USB_PULLUP_OPEN_DRAIN 1
 #endif
 
 #ifndef USES_GPIOA