Coverity analysis defect 99881: Redundant test

Test always evaluates the same

Defect 99881 (STATIC_C)
Checker DEADCODE (subcategory redundant_test)
File: /src/third_party/wiredtiger/src/evict/evict_lru.c
Function __evict_get_ref
/src/third_party/wiredtiger/src/evict/evict_lru.c, line: 1590
At condition "is_app", the value of "is_app" must be equal to 1.

    		if (!urgent_ok && (is_server || (is_app &&

/src/third_party/wiredtiger/src/evict/evict_lru.c, line: 1590
The condition "is_app" must be true.

    		if (!urgent_ok && (is_server || (is_app &&