fix(ble): Increase max size of the firmware string

For some development builds, the firmware version string can get quite
long.  For example: `v1.17-123-g2120027c87da-dirty`.  To ensure such
long versions still get transmitted properly, increase the buffer size
to 32 bytes.  Let's hope that's enough for now...

epicardium/ble/svc_dis.c

@@ -31,7 +31,7 @@
 #include "wsf_trace.h"
 #include "util/bstream.h"
 
-#define DIS_MAXSIZE_FWR_ATT 25
+#define DIS_MAXSIZE_FWR_ATT 32
 #include "svc_dis.h"
 #include "svc_cfg.h"
 #include <string.h>