Gutter icon for overriding rules, include case

In the following example:
```
# Snakefile
rule A:
    input: "input_file_A"
```
```
# boo.smk
include: "Snakefile"

use rule A as boo_A with:
    input: "boo_input_file_A"
```
Gutter icon for the rule A was missed.