[stock / M128] Issue 193 fixed (PWM_BACKLIGHT option added)

[ARM] No SD support after a Tx reboot on ARM flavors
[all] Issue 194 fixed (negative GVARS - on all boards!)
[all] Vario small change on center high limit

src/logs.cpp

@@ -44,7 +44,7 @@ const pm_char * openLogs()
   // Determine and set log file filename
   FRESULT result;
   DIR folder;
-  char filename[24];
+  char filename[32];
 
   if (!sdMounted())
     return STR_NO_SDCARD;