tests: no_prelude: Apply current format style

Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>

Author: amboar

tests/test_compile/pass_cases/no_prelude.rs

@@ -23,6 +23,4 @@ enum TestEnum {
     VarDefault { id: u8, value: u8 },
 }
 
-fn main() {
-    
-}
+fn main() {}