removed 2 more inlines from slave timeout section [issue 6875]

Author: Tech-TX

cores/esp8266/core_esp8266_si2c.cpp

@@ -148,8 +148,8 @@ class Twi
     void attachSlaveRxEvent(void (*function)(uint8_t*, size_t));
     void attachSlaveTxEvent(void (*function)(void));
     void ICACHE_RAM_ATTR reply(uint8_t ack);
-    inline void ICACHE_RAM_ATTR stop(void);
-    inline void ICACHE_RAM_ATTR releaseBus(void);
+    void ICACHE_RAM_ATTR stop(void);
+    void ICACHE_RAM_ATTR releaseBus(void);
     void enableSlave();
 };