Add new acceptance test scenario 030

```
  Error:
    × Main thread panicked.
    ├─▶ at crates/lang/src/uplc.rs:1897:45
    ╰─▶ called `Result::unwrap()` on an `Err` value: ParseIntError { kind: InvalidDigit }
  ```

examples/acceptance_tests/030/aiken.toml

@@ -0,0 +1,2 @@
+name = "acceptance_test_030"
+version = "0.0.0"

examples/acceptance_tests/030/lib/test.ak

@@ -0,0 +1,11 @@
+pub fn abs(a: Int) -> Int {
+  if a < 0 {
+    -a
+  } else {
+    a
+  }
+}
+
+test abs_1() {
+  abs(-14) == 14
+}