Update header files to match source files (#2143)

src/save.c

@@ -826,7 +826,7 @@ bool8 LinkFullSave_SetLastSectorSignature(void)
     return FALSE;
 }
 
-u8 WriteSaveBlock2(void)
+bool8 WriteSaveBlock2(void)
 {
     if (gFlashMemoryPresent != TRUE)
         return TRUE;