Fix ENVFILE reference in .env.staging for desktop and mobile configurations

Author: adrastaea

packages/desktop/.env.staging

@@ -4,5 +4,5 @@ QSS_ALLOWED=true
 QSS_ENDPOINT=ws://qss-lb-d981e6979ef09da9.elb.us-east-1.amazonaws.com:80
 QPS_ALLOWED=true
 LOG_TO_FILE=true
-ENVFILE=.env.development
+ENVFILE=.env.staging
 DEBUG=state-manager*,desktop*,utils*,identity*,backend*,-backend:auth:cryptoService,-backend:Tor*,-backend:TimedQueue

packages/mobile/.env.staging

@@ -5,3 +5,4 @@ COLORIZE=false
 QSS_ALLOWED=true
 QSS_ENDPOINT=ws://qss-lb-d981e6979ef09da9.elb.us-east-1.amazonaws.com:80
 QPS_ALLOWED=true
+ENVFILE=.env.staging