Antoine Stevan 9f01cf333c
stdlib: fix the assert equal tests (#8650)
Related to #8150, #8635 and #8632.

# Description
i've introduced a bad set of tests for the `assert equal` command in
#8150...

they should not compare `1 + 2` and `4)` or `3)` but the ints.

in this PR, i remove this spurious parentheses that were not planned at
all 😬 👀


# User-Facing Changes
```
$nothing
```

# Tests + Formatting
```
>_ nu crates/nu-utils/standard_library/tests.nu
INF|2023-03-28T20:18:13.022|Running tests in test_asserts
INF|2023-03-28T20:18:13.173|Running tests in test_dirs
INF|2023-03-28T20:18:13.247|Running tests in test_logger
INF|2023-03-28T20:18:13.473|Running tests in test_std
```

# After Submitting
```
$nothing
```
2023-03-28 13:34:26 -05:00
..
2023-03-24 14:52:01 +13:00
2023-03-17 21:29:15 +13:00