Add test files I forgot to commit with #4520 (#4598)

substrate/frame/support/test/tests/construct_runtime_ui/default_module_invalid_arg.rs

+use frame_support::construct_runtime;
+
+construct_runtime! {
+	pub enum Runtime where
+		Block = Block,
+		NodeBlock = Block,
+		UncheckedExtrinsic = UncheckedExtrinsic
+	{
+		System: system,
+		Balance: balances::{default, Error},
+	}
+}
+
+fn main() {}

substrate/frame/support/test/tests/construct_runtime_ui/default_module_invalid_arg.stderr

+error: Only the following modules are allowed: `Module`, `Call`, `Storage`, `Event`, `Config`, `Origin`, `Inherent`, `ValidateUnsigned`
+  --> $DIR/default_module_invalid_arg.rs:10:32
+   |
+10 |         Balance: balances::{default, Error},
+   |                                      ^^^^^

substrate/frame/support/test/tests/construct_runtime_ui/invalid_module_entry.rs

+use frame_support::construct_runtime;
+
+construct_runtime! {
+	pub enum Runtime where
+		Block = Block,
+		NodeBlock = Block,
+		UncheckedExtrinsic = UncheckedExtrinsic
+	{
+		System: system,
+		Balance: balances::{Error},
+	}
+}
+
+fn main() {}

substrate/frame/support/test/tests/construct_runtime_ui/invalid_module_entry.stderr

+error: Only the following modules are allowed: `Module`, `Call`, `Storage`, `Event`, `Config`, `Origin`, `Inherent`, `ValidateUnsigned`
+  --> $DIR/invalid_module_entry.rs:10:23
+   |
+10 |         Balance: balances::{Error},
+   |                             ^^^^^