Fix indexing in the test runner's log formatting

Author: LewisGaul

lib/test_runner.zig

@@ -127,7 +127,10 @@ pub fn log(
         log_err_count += 1;
     }
     if (@enumToInt(message_level) <= @enumToInt(std.testing.log_level)) {
-        std.debug.print("[{s}] ({s}): " ++ format ++ "\n", .{ @tagName(scope), @tagName(message_level) } ++ args);
+        std.debug.print(
+            "[" ++ @tagName(scope) ++ "] (" ++ @tagName(message_level) ++ "): " ++ format ++ "\n",
+            args,
+        );
     }
 }