do not replace variables with unresolved counterparts

src/ytdl_sub/script/types/variable_dependency.py

@@ -281,7 +281,5 @@ class VariableDependency(ABC):
             elif isinstance(arg, Variable):
                 if arg not in resolved_variables:
                     is_resolvable = False
-                    if arg in unresolved_variables:
-                        maybe_resolvable_args[-1] = unresolved_variables[arg]
 
         return maybe_resolvable_args, is_resolvable