remove redundant deprecated-utility setting from flow configs

Summary:
Changelog: [Internal]

This lint is now an error by default, so we no longer need to manually specify it as such in the flowconfig

Reviewed By: gkz

Differential Revision: D23145523

fbshipit-source-id: 6c104563793fbc67c8b15b7310e96d1750d21df3

.flowconfig

@@ -68,7 +68,6 @@ deprecated-type=warn
 unsafe-getters-setters=warn
 unnecessary-invariant=warn
 signature-verification-failure=warn
-deprecated-utility=error
 
 [strict]
 deprecated-type

.flowconfig.android

@@ -68,7 +68,6 @@ deprecated-type=warn
 unsafe-getters-setters=warn
 unnecessary-invariant=warn
 signature-verification-failure=warn
-deprecated-utility=error
 
 [strict]
 deprecated-type

template/_flowconfig

@@ -56,7 +56,6 @@ deprecated-type=warn
 unsafe-getters-setters=warn
 unnecessary-invariant=warn
 signature-verification-failure=warn
-deprecated-utility=error
 
 [strict]
 deprecated-type