Fix clippy complaint in generator/ and x11rb-protocol/benches/

[psychon]

error: named argument `width` is not used by name
  --> generator/src/generator/special_cases.rs:44:21
   |
33 | ///     format: {},
   |                 -- this formatting argument uses named argument `width` by position
...
44 |                     width = width,
   |                     ^^^^^ this named argument is referred to by position in formatting string
   |
   = note: `-D named-arguments-used-positionally` implied by `-D warnings`
help: use the named argument by name to avoid ambiguity
   |
33 | ///     format: {width},
   |                  +++++

Signed-off-by: Uli Schlachter [email protected]

---

Now also fixes:

error: this expression borrows a value the compiler would automatically borrow
  --> x11rb-protocol/benches/proto_connection.rs:79:21
   |
79 |                     (&mut v[2..4]).copy_from_slice(&our_seqno.to_ne_bytes());
   |                     ^^^^^^^^^^^^^^ help: change this to: `v[2..4]`
   |
   = note: `-D clippy::needless-borrow` implied by `-D warnings`
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow

[codecov]

Codecov Report

Merging #752 (62d2b42) into master (cac9118) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #752   +/-   ##
=======================================
  Coverage   13.54%   13.54%           
=======================================
  Files         141      141           
  Lines      119916   119916           
=======================================
+ Hits        16238    16239    +1     
+ Misses     103678   103677    -1     

Flag	Coverage Δ
tests	13.54% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
generator/src/generator/special_cases.rs	99.41% <100.00%> (ø)
x11rb-protocol/src/resource_manager/parser.rs	96.44% <0.00%> (+0.16%)	⬆️

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[psychon]

The msrv-check build failure is serde-rs/serde#2255 and will hopefully resolve itself via a new serde release.

[psychon]

Review timeout. This is simple enough that I'll just go ahead and merge this.