minor bugfixes to hf mf sniff and hf 14a snoop

- tracing was not always enabled when starting hf mf sniff or hf 14a snoop
- ATQA was displayed in wrong byte order in hf mf sniff
- 4 Byte UIDs were displayed as 7 Byte UIDs (padded with 0x000000) in hf mf sniff
- same for logfile names.
- assignment (=) had been used instead of == in comparisons (shouldn't have been relevant though)

armsrc/iso14443a.c

@@ -507,6 +507,7 @@ void RAMFUNC SnoopIso14443a(uint8_t param) {
 	LEDsoff();
 	// init trace buffer
 	iso14a_clear_trace();
+	iso14a_set_tracing(TRUE);
 
 	// We won't start recording the frames that we acquire until we trigger;
 	// a good trigger condition to get started is probably when we see a
@@ -2623,7 +2624,8 @@ void RAMFUNC SniffMifare(uint8_t param) {
 	// C(red) A(yellow) B(green)
 	LEDsoff();
 	// init trace buffer
-    iso14a_clear_trace();
+	iso14a_clear_trace();
+	iso14a_set_tracing(TRUE);
 
 	// The command (reader -> tag) that we're receiving.
 	// The length of a received command will in most cases be no more than 18 bytes.