org-clock: Fix CLOCK_INTO_DRAWER property check
* lisp/org-clock.el (org-clock-into-drawer): Fix processing of
properties so that they can override global value.
Previously, if the 'CLOCK_INTO_DRAWER' or 'LOG_INTO_DRAWER' property was
nil, the local property setting would not override the global
variable [1]. These changes make the behavior match the docstring
description ('CLOCK_INTO_DRAWER' and 'LOG_INTO_DRAWER' properties
override `org-clock-into-drawer', with 'CLOCK_INTO_DRAWER' given
precedence).
[1] http://stackoverflow.com/questions/
26405415/how-to-locally-unset-org-clock-into-drawer-t
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