fix(hydroflow_plus): drop nightly feature flag from trybuild codegen … #963

Job	Run time
pre_job	4s
macos-universal (universal2-apple-darwin)	4m 10s
windows (x86_64-pc-windows-msvc, x64)	10m 2s
linux-cross (aarch64-unknown-linux-gnu, aarch64)	3m 32s
windows (i686-pc-windows-msvc, x86)	10m 43s
linux (x86_64-unknown-linux-gnu)	3m 33s
linux-cross (armv7-unknown-linux-gnueabihf, armv7)	3m 44s
windows (aarch64-pc-windows-msvc, x64)	11m 26s
linux (i686-unknown-linux-gnu)	4m 49s
Release	0s
	52m 3s

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