enable error reporting from enable_vt_processing (#8373)

# Description

This PR tweaks the enable_vt_processing() function with more verbose
error handling. This is related to #8344.

# User-Facing Changes

_(List of all changes that impact the user experience here. This helps
us keep track of breaking changes.)_

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.

crates/nu-utils/src/utils.rs

@@ -9,19 +9,18 @@ pub fn enable_vt_processing() -> Result<()> {
 
         pub const ENABLE_PROCESSED_OUTPUT: u32 = 0x0001;
         pub const ENABLE_VIRTUAL_TERMINAL_PROCESSING: u32 = 0x0004;
-        // let mask = ENABLE_VIRTUAL_TERMINAL_PROCESSING;
+        let mask = ENABLE_VIRTUAL_TERMINAL_PROCESSING;
 
         let console_mode = ConsoleMode::from(Handle::current_out_handle()?);
         let old_mode = console_mode.mode()?;
 
         // researching odd ansi behavior in windows terminal repo revealed that
         // enable_processed_output and enable_virtual_terminal_processing should be used
-        // also, instead of checking old_mode & mask, just set the mode already
 
-        // if old_mode & mask == 0 {
-        console_mode
-            .set_mode(old_mode | ENABLE_PROCESSED_OUTPUT | ENABLE_VIRTUAL_TERMINAL_PROCESSING)?;
-        // }
+        if old_mode & mask == 0 {
+            console_mode
+                .set_mode(old_mode | ENABLE_PROCESSED_OUTPUT | ENABLE_VIRTUAL_TERMINAL_PROCESSING)?
+        }
     }
     Ok(())
 }