BUG: Don't index non-executable items under Programs

### Checks

- [x] I have checked that this issue has not already been reported.

- [x] I am using the latest version of Flow Launcher.

- [ ] I am using the prerelease version of Flow Launcher.

### Problem Description

I haven't been able to find an issue that corresponds with this, but if I missed it, apologies.

The issue is as follows: I only use Flow Launcher to start programs, commands and windows settings. However, when I for instance search for `note`, I'd expect Notepad++ or at least Notepad to show up. Instead, it shows text documents that reside within the Programs folder of the Start Menu (see the screenshots for an example).

I would expect to only show shortcuts to executables, not images/documents/etc. Or at least, the option to exclude them, perhaps on an extension level. I understand the complexity resides in that you have to follow the shortcut to determine what file it is.

Besides this, thanks for this great tool - using it daily, fantastic work :)

### To Reproduce

1. Have Flow Launcher configured as shown in the screenshots
2. Have Notepad++ installed, and at least one application that has text documents in their Start menu folder
3. Search `note`

### Screenshots

This is what shows when I search for `note` (they are in fact shortcuts to the actual documents, despite the extension):


It works when I add another `p`:


My plugins are set as follows:


The program plugin is configured as follows:


### Flow Launcher Version

1.20.1

### Windows Build Number

10.0.26100.4484

### Error Log

n/a