Remove PR define, replace with TRACE_DEBUG

The define PR was introduced to switch quickly between TRACE levels
for specific debug print messages.

Now, it all became debug output, since it is not needed in normal
operation.
diff --git a/firmware/src_simtrace/phone.c b/firmware/src_simtrace/phone.c
index 6138dab..0ea3a33 100644
--- a/firmware/src_simtrace/phone.c
+++ b/firmware/src_simtrace/phone.c
@@ -108,8 +108,6 @@
 
 static struct Usart_info usart_info = {.base = USART_PHONE, .id = ID_USART_PHONE, .state = USART_RCV};
 
-#define PR  TRACE_INFO
-
 /* ===================================================*/
 /*                      Taken from iso7816_4.c        */
 /* ===================================================*/
@@ -131,8 +129,8 @@
         TRACE_ERROR("USB err status: %d (%s)\n", __FUNCTION__, status);
         return;
     }
-    PR("sendResp, stat: %X, trnsf: %x, rem: %x\n\r", status, transferred, remaining);
-    PR("Resp: %x %x %x .. %x\n", host_to_sim_buf[0], host_to_sim_buf[1], host_to_sim_buf[2], host_to_sim_buf[transferred-1]);
+    TRACE_DEBUG("sendResp, stat: %X, trnsf: %x, rem: %x\n\r", status, transferred, remaining);
+    TRACE_DEBUG("Resp: %x %x %x .. %x\n", host_to_sim_buf[0], host_to_sim_buf[1], host_to_sim_buf[2], host_to_sim_buf[transferred-1]);
 
     USART_SetReceiverEnabled(USART_PHONE, 0);
     USART_SetTransmitterEnabled(USART_PHONE, 1);