Revert "preset: build with no assertion for swiftpm on linux (#81217)"

This reverts commit 39cf29b.

Author: bkhouri

utils/build-presets.ini

@@ -1970,9 +1970,7 @@ mixin-preset=mixin_swiftpm_linux_platform
 
 # Build Release without debug info, because it is faster to build.
 release
-# work around https://github.com/swiftlang/swift/issues/81144
 assertions
-no-swift-stdlib-assertions
 
 # Downstream projects that import llbuild+SwiftPM.
 sourcekit-lsp
@@ -1984,7 +1982,6 @@ skip-test-toolchain-benchmarks
 
 skip-test-llbuild
 
-
 #===------------------------------------------------------------------------===#
 # Test llbuild on macOS builder
 #===------------------------------------------------------------------------===#