tests/extmod/vfs_fat_ramdisk: Make it work on pyboard.

tests/extmod/vfs_fat_ramdisk.py

@@ -63,7 +63,7 @@ with vfs.open("foo_file.txt", "w") as f:
 print(vfs.listdir())
 
 print("stat root:", vfs.stat("/"))
-print("stat file:", vfs.stat("foo_file.txt"))
+print("stat file:", vfs.stat("foo_file.txt")[:-3]) # timestamps differ across runs
 
 print(b"FOO_FILETXT" in bdev.data)
 print(b"hello!" in bdev.data)

tests/extmod/vfs_fat_ramdisk.py.exp

@@ -5,7 +5,7 @@ getcwd: /
 True
 ['foo_file.txt']
 stat root: (16384, 0, 0, 0, 0, 0, 0, 0, 0, 0)
-stat file: (32768, 0, 0, 0, 0, 0, 6, -631238400, -631238400, -631238400)
+stat file: (32768, 0, 0, 0, 0, 0, 6)
 True
 True
 getcwd: /foo_dir