fix addFlashArea()

Author: MaBecker

targets/esp32/jshardware.c

@@ -736,7 +736,7 @@ JsVar *jshFlashGetFree() {
   // Space reserved here in the parition table -  using sub type 0x40
   // This should be read from the partition table
   addFlashArea(jsFreeFlash, 0xE000,  0x2000);
-  addFlashArea(jsFreeFlash, 0x2B0000, 0x10000);
+  addFlashArea(jsFreeFlash, 0x310000, 0x10000);
 
   return jsFreeFlash;
 }