Fix double quote error on locale (#3481)

Author: Samze

Makefile

@@ -2,7 +2,7 @@ CF_DIAL_TIMEOUT ?= 15
 NODES ?= 10
 FLAKE_ATTEMPTS ?=5
 PACKAGES ?= api actor command types util version integration/helpers
-LC_ALL = "en_US.UTF-8"
+LC_ALL = en_US.UTF-8
 
 ## TODO: Change when new version is released
 CF_BUILD_VERSION ?= v9.0.0