Update breez-sdk mock to the new pay on-chain API (#1111) #279

Job	Run time
cross-compile-android (aarch64-linux-android, true)	6m 50s
cross-compile-ios (x86_64-apple-ios, true)	5m 34s
cross-compile-android (armv7-linux-androideabi, true)	7m 3s
cross-compile-ios (aarch64-apple-ios, true)	4m 53s
cross-compile-android (i686-linux-android, true)	6m 32s
cross-compile-ios (aarch64-apple-ios-sim, true)	4m 52s
lipo-ios (true)	27s
deploy-ios (true)	2m 4s
deploy-android (true)	1m 17s
determine-branch	3s
build-docs	0s
deploy-docs	0s
	39m 35s

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