esp8266/modules: Mount filesystem at root when creating for first time.

esp8266/modules/_boot.py

@@ -8,6 +8,6 @@ try:
         uos.mount(bdev, '/')
 except OSError:
     import inisetup
-    vfs = inisetup.setup()
+    inisetup.setup()
 
 gc.collect()

esp8266/modules/inisetup.py

@@ -38,8 +38,7 @@ def setup():
     wifi()
     uos.VfsFat.mkfs(bdev)
     vfs = uos.VfsFat(bdev)
-    uos.mount(vfs, '/flash')
-    uos.chdir('/flash')
+    uos.mount(vfs, '/')
     with open("boot.py", "w") as f:
         f.write("""\
 # This file is executed on every boot (including wake-boot from deepsleep)