allow bools to be type checked with each other (#13968)

# Description

This PR allows bools to be type checked against each other.


![image](https://github.com/user-attachments/assets/64dc36f8-59bc-4e66-8380-6b693c77a2d3)

I looked for test and maybe we don't have any for type checked math
stuff. I didn't see any.

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# Tests + Formatting
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crates/nu-parser/src/type_check.rs

@@ -480,6 +480,7 @@ pub fn math_result_type(
                 (Type::Duration, Type::Duration) => (Type::Bool, None),
                 (Type::Date, Type::Date) => (Type::Bool, None),
                 (Type::Filesize, Type::Filesize) => (Type::Bool, None),
+                (Type::Bool, Type::Bool) => (Type::Bool, None),
 
                 (Type::Custom(a), Type::Custom(b)) if a == b => (Type::Custom(a.clone()), None),
                 (Type::Custom(a), _) => (Type::Custom(a.clone()), None),
@@ -530,6 +531,7 @@ pub fn math_result_type(
                 (Type::Duration, Type::Duration) => (Type::Bool, None),
                 (Type::Date, Type::Date) => (Type::Bool, None),
                 (Type::Filesize, Type::Filesize) => (Type::Bool, None),
+                (Type::Bool, Type::Bool) => (Type::Bool, None),
 
                 (Type::Custom(a), Type::Custom(b)) if a == b => (Type::Custom(a.clone()), None),
                 (Type::Custom(a), _) => (Type::Custom(a.clone()), None),
@@ -580,6 +582,7 @@ pub fn math_result_type(
                 (Type::Duration, Type::Duration) => (Type::Bool, None),
                 (Type::Date, Type::Date) => (Type::Bool, None),
                 (Type::Filesize, Type::Filesize) => (Type::Bool, None),
+                (Type::Bool, Type::Bool) => (Type::Bool, None),
 
                 (Type::Custom(a), Type::Custom(b)) if a == b => (Type::Custom(a.clone()), None),
                 (Type::Custom(a), _) => (Type::Custom(a.clone()), None),
@@ -630,6 +633,7 @@ pub fn math_result_type(
                 (Type::Duration, Type::Duration) => (Type::Bool, None),
                 (Type::Date, Type::Date) => (Type::Bool, None),
                 (Type::Filesize, Type::Filesize) => (Type::Bool, None),
+                (Type::Bool, Type::Bool) => (Type::Bool, None),
 
                 (Type::Custom(a), Type::Custom(b)) if a == b => (Type::Custom(a.clone()), None),
                 (Type::Custom(a), _) => (Type::Custom(a.clone()), None),