fix Seq implicit conversions warnings

[xuwei-k]

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Helpful things

Fixes

Fix warnings

Purpose

use ArraySeq.unsafeWrapArray, toSeq or something

Background Context

https://app.travis-ci.com/github/playframework/playframework/jobs/557628971#L1164

[warn] /home/travis/build/playframework/playframework/transport/server/play-server/src/main/scala/play/core/server/ProdServerStart.scala:29:69: method copyArrayToImmutableIndexedSeq in class LowPriorityImplicits2 is deprecated (since 2.13.0): Implicit conversions from Array to immutable.IndexedSeq are implemented by copying; Use the more efficient non-copying ArraySeq.unsafeWrapArray or an explicit toIndexedSeq call
[warn]   def main(args: Array[String]): Unit = start(new RealServerProcess(args))
[warn]                                                                     ^
[warn] /home/travis/build/playframework/playframework/transport/server/play-server/src/main/scala/play/core/server/common/ServerResultUtils.scala:337:61: method copyArrayToImmutableIndexedSeq in class LowPriorityImplicits2 is deprecated (since 2.13.0): Implicit conversions from Array to immutable.IndexedSeq are implemented by copying; Use the more efficient non-copying ArraySeq.unsafeWrapArray or an explicit toIndexedSeq call
[warn]     cookieHeaderEncoding.SetCookieHeaderSeparatorRegex.split(value)
[warn]                                                             ^

[warn] /home/travis/build/playframework/playframework/persistence/play-jdbc-evolutions/src/main/scala/play/api/db/evolutions/Evolutions.scala:63:68: method copyArrayToImmutableIndexedSeq in class LowPriorityImplicits2 is deprecated (since 2.13.0): Implicit conversions from Array to immutable.IndexedSeq are implemented by copying; Use the more efficient non-copying ArraySeq.unsafeWrapArray or an explicit toIndexedSeq call
[warn]     sql.split("(?<!;);(?!;)").map(_.trim.replace(";;", ";")).filter(_ != "")
[warn]                                                                    ^

References