Use Maven Central for fbjni artifact

Summary:
FBJNI version have been updated recently and the new version is available on Maven Central, so we can remove this exception.

Changelog: [Internal]

Reviewed By: mdvacca

Differential Revision: D28355443

fbshipit-source-id: 1b3d88b668fed12deb786d36672f07dc98709aa0

build.gradle.kts

@@ -41,7 +41,6 @@ allprojects {
         jcenter {
           content {
             includeModule("com.facebook.yoga", "proguard-annotations")
-            includeModule("com.facebook.fbjni", "fbjni-java-only")
             includeModule("com.facebook.fresco", "stetho")
           }
         }