from_input does not return true

I've never used this function before, but since the pipeline editor defaults to the UI, i thought i'd give the pipeline GUI editor a try.

I cannot get any pipeline rules to correctly return true when i use `from_input`. I'd tried both the input name as well as the input id.

Using `get_field("gl2_source_input") == ""` does work.

Example:

Pipeline rule:

```
rule "route for testing duplicating messages"
when
// get_field("gl2_source_input") == "662017e1cfcecf538d9a72f5z" ||
from_input(
id : "662017e1cfcecf538d9a72f5"
)
then
set_field(
field : "aaatest",
value : "test"
);
end
```

## Expected Behavior

`from_input` returns true if the condition is true

## Current Behavior

`from_input` always returns false.

## Possible Solution

## Steps to Reproduce (for bugs)

1. Create a pipeline using `from_input` using the rule editor tester

## Context

## Your Environment

* Graylog Version: 6.0.1
* Browser version: Google Chrome Version 125.0.6422.61 (Official Build) (arm64)

Please let me know if there are any questions.