Fix assertion message (#6448)

It previously said `exotic-mod must be loaded. ==> expected: <betamindy> but was: <exotic-mod>` when it failed which makes absolutely no sense.

tests/src/test/java/GenericModTest.java

@@ -27,6 +27,6 @@ public class GenericModTest{
     static void checkExistence(String modName){
         assertNotEquals(Vars.mods, null);
         assertNotEquals(Vars.mods.list().size, 0, "At least one mod must be loaded.");
-        assertEquals(Vars.mods.list().first().name, modName, modName + " must be loaded.");
+        assertEquals(modName, Vars.mods.list().first().name, modName + " must be loaded.");
     }
 }