make unit tests pass

changes to how config defaults, specifically allowing defaults to be a
vector, broke unit test compilation. this makes them compile again.

test/config/test_llarp_config_definition.cpp

@@ -10,20 +10,21 @@ TEST_CASE("OptionDefinition int parse test", "[config]")
 
   CHECK(def.getValue() == 42);
   CHECK(def.getNumberFound() == 0);
-
-  CHECK(def.defaultValueAsString() == "42");
+  CHECK(def.defaultValuesAsString().size() == 1);
+  CHECK(def.defaultValuesAsString()[0] == "42");
 
   CHECK_NOTHROW(def.parseValue("43"));
   CHECK(def.getValue() == 43);
   CHECK(def.getNumberFound() == 1);
 
-  CHECK(def.defaultValueAsString() == "42");
+  CHECK(def.defaultValuesAsString().size() == 1);
+  CHECK(def.defaultValuesAsString()[0] == "42");
 
   constexpr Default sqrt_625{25};
   llarp::OptionDefinition<int> def2("a", "b", sqrt_625);
   CHECK(def2.getValue() == 25);
-  CHECK(def2.defaultValueAsString() == "25");
-
+  CHECK(def2.defaultValuesAsString().size() == 1);
+  CHECK(def2.defaultValuesAsString()[0] == "25");
   CHECK_NOTHROW(def2.parseValue("99"));
   CHECK(def2.getValue() == 99);
   CHECK(def2.getNumberFound() == 1);
@@ -34,7 +35,8 @@ TEST_CASE("OptionDefinition string parse test", "[config]")
   llarp::OptionDefinition<std::string> def("foo", "bar", Default{"test"});
 
   CHECK(def.getValue() == "test");
-  CHECK(def.defaultValueAsString() == "test");
+  CHECK(not def.defaultValuesAsString().empty());
+  CHECK(def.defaultValuesAsString()[0] == "test");
 
   CHECK_NOTHROW(def.parseValue("foo"));
   CHECK(def.getValue() == "foo");
@@ -80,8 +82,8 @@ TEST_CASE("OptionDefinition acceptor test", "[config]")
 
   CHECK_NOTHROW(def.tryAccept());
   CHECK(def.getValue() == 42);
-  CHECK(def.defaultValue);
-  CHECK(*def.defaultValue == 42);
+  CHECK(not def.defaultValues.empty());
+  CHECK(def.defaultValues[0] == 42);
   CHECK(test == 42);
 
   def.parseValue("43");