Fix bug on send 'x' instead of 'z'

BUG=chromium:50216
TEST=Manually

Change-Id: Ic19396216bcb31290711511ba7bdd02538e8177f
Reviewed-on: https://chromium-review.googlesource.com/329227
Tested-by: danny chan <dchan@chromium.org>
Reviewed-by: Venkata Srinivasa Raju Penmatcha <venkataraju@google.com>
diff --git a/usbkm232/kb.py b/usbkm232/kb.py
index a1adc60..8077ff6 100755
--- a/usbkm232/kb.py
+++ b/usbkm232/kb.py
@@ -114,7 +114,7 @@
   87: ['<lshift>', 'w'],
   88: ['<lshift>', 'x'],
   89: ['<lshift>', 'y'],
-  90: ['<lshift>', 'x'],
+  90: ['<lshift>', 'z'],
   91: ['['],
   92: ['\\'],
   93: [']'],