serial: reorganize functions, drop unused char array

src/inputs/Serial.h

@@ -47,15 +47,15 @@ private:
       EscapeSequence,
       CSI
     };
+
     String m_buf;
     ParseState m_state;
-    char m_escapeSeq[3];
-    void doCommand();
     LogPrinter m_logPrinter;
     bool m_canRedraw = true;
     Ringbuf<String, 5> m_history;
     int m_historyOffset = 0;
 
+    void doCommand();
     InputEvent parseNormal(char nextChar);
     InputEvent parseEscape(char nextChar);
     InputEvent parseCSI(char nextChar);