Fixed unintented env var addition

library/mono

@@ -92,11 +92,11 @@
 4.6.1.5-onbuild: git://github.com/mono/docker@8e5f8d9d00f596b838bf8d7d307ddb47f008a691 4.6.1.5/onbuild
 4.6.1-onbuild: git://github.com/mono/docker@8e5f8d9d00f596b838bf8d7d307ddb47f008a691 4.6.1.5/onbuild
 
-4.6.2.16: git://github.com/mono/docker@e1b6667f66443a0b768d9681c68bbb1e2f898601 4.6.2.16
-4.6.2: git://github.com/mono/docker@e1b6667f66443a0b768d9681c68bbb1e2f898601 4.6.2.16
-4.6: git://github.com/mono/docker@e1b6667f66443a0b768d9681c68bbb1e2f898601 4.6.2.16
-4: git://github.com/mono/docker@e1b6667f66443a0b768d9681c68bbb1e2f898601 4.6.2.16
-latest: git://github.com/mono/docker@e1b6667f66443a0b768d9681c68bbb1e2f898601 4.6.2.16
+4.6.2.16: git://github.com/mono/docker@1db7e68061e2aaf81ed5ac413c217a7fd12c0228 4.6.2.16
+4.6.2: git://github.com/mono/docker@1db7e68061e2aaf81ed5ac413c217a7fd12c0228 4.6.2.16
+4.6: git://github.com/mono/docker@1db7e68061e2aaf81ed5ac413c217a7fd12c0228 4.6.2.16
+4: git://github.com/mono/docker@1db7e68061e2aaf81ed5ac413c217a7fd12c0228 4.6.2.16
+latest: git://github.com/mono/docker@1db7e68061e2aaf81ed5ac413c217a7fd12c0228 4.6.2.16
 
 4.6.2.16-onbuild: git://github.com/mono/docker@e1b6667f66443a0b768d9681c68bbb1e2f898601 4.6.2.16/onbuild
 4.6.2-onbuild: git://github.com/mono/docker@e1b6667f66443a0b768d9681c68bbb1e2f898601 4.6.2.16/onbuild