Remove deprecated-call-syntax lint setting

Summary:
This lint setting makes deprecated $call syntax a warning instead of an error,
which is the default. This feature has been deprecated since Flow v0.75.0, and
I'm working to finally remove it, which will also remove this lint setting.

Reviewed By: dsainati1

Differential Revision: D14650366

fbshipit-source-id: 779df61be88996278ea63355517c17ec721cea7f

.flowconfig

@@ -86,7 +86,6 @@ deprecated-type=warn
 unsafe-getters-setters=warn
 inexact-spread=warn
 unnecessary-invariant=warn
-deprecated-call-syntax=warn
 signature-verification-failure=warn
 deprecated-utility=error
 

.flowconfig.android

@@ -86,7 +86,6 @@ deprecated-type=warn
 unsafe-getters-setters=warn
 inexact-spread=warn
 unnecessary-invariant=warn
-deprecated-call-syntax=warn
 signature-verification-failure=warn
 deprecated-utility=error