Remove deprecated FDL methods

[ryanwilson]

firebase-ios-sdk/Firebase/DynamicLinks/Public/FDLURLComponents.h

Line 520 in da3c019

NS_SWIFT_UNAVAILABLE("Use init(link:domain:)")DEPRECATED_MSG_ATTRIBUTE(

and

firebase-ios-sdk/Firebase/DynamicLinks/Public/FDLURLComponents.h

Line 536 in da3c019

DEPRECATED_MSG_ATTRIBUTE(

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[dmandar]

Fixed: #2768