decodeIRJson bugfix: avoid buffer overrun #272

Increase the size of objKey to accommodate 32bit code number.
The previous buffer size was too small.

Author: softhack007

wled00/ir.cpp

@@ -673,7 +673,7 @@ the json file.
 */
 void decodeIRJson(uint32_t code)
 {
-  char objKey[10];
+  char objKey[16] = {'\0'}; // WLEDMM: 13 chars, not 9!  '"0x' + 'FFFFFFFF' + '":' + '\0'
   String cmdStr;
   JsonObject fdo;
   JsonObject jsonCmdObj;