ct in pls found

can also found in lowercase

src/Audio.cpp

@@ -2,7 +2,7 @@
  * Audio.cpp
  *
  *  Created on: Oct 26,2018
- *  Updated on: Aug 29a,2021
+ *  Updated on: Aug 29b,2021
  *      Author: Wolle (schreibfaul1)
  *
  */
@@ -2192,6 +2192,10 @@ void Audio::processPlayListData() {
             f_ct = true;                                        // found ContentType in pl
         }
 
+        if(indexOf(pl, "content-type:", 0)){
+            f_ct = true;                                        // found ContentType in pl
+        }
+
         if((indexOf(pl, "Connection:close", 0) >= 0) && !f_ct){ // #193 is not a playlist if no ct found
             m_datamode = AUDIO_HEADER;
         }