Fix trailing semicolon warnings on latest rustc nightly

[TheBlueMatt]

Latest rustc nightly compiles are filled with warnings like the
following, which we fix here:

warning: trailing semicolon in macro used in expression position
   --> lightning/src/util/macro_logger.rs:163:114
    |
163 |         $logger.log(&$crate::util::logger::Record::new($lvl, format_args!($($arg)+), module_path!(), file!(), line!()));
    |                                                                                                                        ^
    |
   ::: lightning/src/chain/chainmonitor.rs:165:9
    |
165 |         log_debug!(self.logger, "New best block {} at height {} provided via block_connected", header.block_hash(), height);
    |         -------------------------------------------------------------------------------------------------------------------- in this macro invocation
    |
    = note: `#[warn(semicolon_in_expressions_from_macros)]` on by default
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
    = note: this warning originates in the macro `log_internal` (in Nightly builds, run with -Z macro-backtrace for more info)

[codecov]

Codecov Report

Merging #1049 (cb7faf8) into main (803d804) will decrease coverage by 0.00%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main    #1049      +/-   ##
==========================================
- Coverage   90.82%   90.82%   -0.01%     
==========================================
  Files          65       65              
  Lines       32801    32801              
==========================================
- Hits        29793    29792       -1     
- Misses       3008     3009       +1     

Impacted Files	Coverage Δ
lightning/src/ln/functional_tests.rs	97.49% <ø> (-0.02%)	⬇️
lightning/src/ln/peer_handler.rs	45.75% <0.00%> (ø)
lightning/src/util/macro_logger.rs	87.87% <100.00%> (ø)

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