Test always evaluates the same

Defect 72697 (STATIC_C)
Checker DEADCODE (subcategory redundant_test)
File: /src/third_party/wiredtiger/src/session/session_dhandle.c
Function __wt_session_lock_dhandle
/src/third_party/wiredtiger/src/session/session_dhandle.c, line: 160
At condition "want_exclusive", the value of "want_exclusive" must be equal to 1.

    		if (ret != EBUSY || (is_open && want_exclusive))

/src/third_party/wiredtiger/src/session/session_dhandle.c, line: 77
Assigning: "want_exclusive" = "(flags & 8U) ? 1 : 0".

    	want_exclusive = LF_ISSET(WT_DHANDLE_EXCLUSIVE) ? 1 : 0;

/src/third_party/wiredtiger/src/session/session_dhandle.c, line: 160
The condition "want_exclusive" must be true.

    		if (ret != EBUSY || (is_open && want_exclusive))