fix FS#13864: Last char of folder and filename not voiced

Change-Id: I9c237bb7721224c6ba44b6511d72094722fa980c

apps/talk.c

@@ -765,7 +765,7 @@ static int _talk_spell(const char* spell, size_t len, bool enqueue)
     do_enqueue(enqueue); /* cut off all the pending stuff */
 
     const char *last = spell;
-    size_t len0 = len - 1;
+    size_t len0 = len;
     /* Tokenize into UTF8 codepoints */
     while ((spell = utf8decode(spell, &c)), c != '\0')
     {