CXX-1053 Avoid passing stdx::optional to Catch comparison expression

Catch attempts to convert comparison operands to strings with
operator<<() (in case of an assertion failure), and this causes a
compile error in some configurations when the operand is of type
boost::optional<T>, since we don't currently include optional_io.hpp.

Author: jrassi

src/mongocxx/test/options/create_collection.cpp

@@ -60,9 +60,9 @@ TEST_CASE("create_collection accessors/mutators", "[create_collection]") {
     }
     SECTION("has a method to set the validation_criteria") {
         cc.validation_criteria(validation);
-        REQUIRE(cc.validation_criteria()->rule() == validation.rule());
-        REQUIRE(cc.validation_criteria()->level() == validation.level());
-        REQUIRE(cc.validation_criteria()->action() == validation.action());
+        REQUIRE(*cc.validation_criteria()->rule() == *validation.rule());
+        REQUIRE(*cc.validation_criteria()->level() == *validation.level());
+        REQUIRE(*cc.validation_criteria()->action() == *validation.action());
     }
 }