unexpand: codegen-units=1 - improve performance by 7.18% (#10817)

Removed uu_unexpand profile configuration from Cargo.toml.

Author: oech3

Cargo.toml

@@ -607,8 +607,6 @@ codegen-units = 1
 # FIXME: https://github.com/uutils/coreutils/issues/10654
 [profile.release.package.uu_expand]
 codegen-units = 16
-[profile.release.package.uu_unexpand]
-codegen-units = 16
 
 # A release-like profile that is as small as possible.
 [profile.release-small]