Revert "FIXME: try enabling dcheck to see if that will get us more info on linux-release-testing"

This reverts commit 1a17ce81d5.

build/args/release.gn

@@ -3,9 +3,6 @@ is_component_build = false
 is_official_build = true
 strip_debug_info = true
 
-# FIXME(jeremy): this is just for testing on CI.
-dcheck_always_on = true
-
 # This may be guarded behind is_chrome_branded alongside
 # proprietary_codecs https://webrtc-review.googlesource.com/c/src/+/36321,
 # explicitly override here to build OpenH264 encoder/FFmpeg decoder.