Resolving linter issue with keypair commenting

[roryharr]

Problem

• linter is failing due to interleaved pulls

error: variables can be used directly in the `format!` string
   --> clap-utils/src/keypair.rs:185:43
    |
185 |                       std::io::Error::other(format!(
    |  ___________________________________________^
186 | |                         "No default signer found, run \"solana-keygen new -o {}\" to create a new \
187 | |                          one",
188 | |                         default_path
189 | |                     ))
    | |_____________________^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#uninlined_format_args
    = note: requested on the command line with `-D clippy::uninlined-format-args`

Summary of Changes

• Fix formatting to match expecations

Fixes #

[steviez]

For sake of papertrail, the PR that added the new lint was #7826. #7849 introduced the breaking change, but it was created before 7826 had been merged

[roryharr]

Going to squash and merge. It is getting further than before.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.0%. Comparing base (09d520c) to head (915b795).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #7870     +/-   ##
=========================================
- Coverage    83.1%    83.0%   -0.1%     
=========================================
  Files         810      810             
  Lines      356624   356636     +12     
=========================================
- Hits       296382   296364     -18     
- Misses      60242    60272     +30     

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