Fixup WM_STATE type mismatch

[lambdadog]

Fixes an error with the implementation of #53. It seems WM_STATE is expected to be 32 bits, but I had passed it as a uint8 instead.

Prior to the fix, xprop (on an xterm window) reports:

WM_STATE(WINDOW): Type mismatch: assumed size 32 bits, actual size 8 bits.

After applied, it reports:

WM_STATE(WINDOW):
                window state: Normal
                icon window: <field not available>