un-revert the removal of the active=true method

Author: mcabbott

src/deprecations.jl

@@ -186,17 +186,6 @@ function update!(opt::Optimise.AbstractOptimiser, ::Params, grads::Union{Tuple,
 end
 
 
-function dropout(rng, x, p; dims=:, active::Bool=true)
-  if active
-    NNlib.dropout(rng, x, p; dims)
-  else
-    Base.depwarn("Flux.dropout(...; active=false) is deprecated. Please branch outside the function, or call dropout(x, 0) if you must.", :dropout)
-    return x
-  end
-end
-dropout(x, p; kwargs...) = dropout(NNlib._rng_from_array(x), x, p; kwargs...)
-
-
 # v0.14 deprecations
 
 # Enable these when 0.14 is released, and delete const ClipGrad = Optimise.ClipValue etc: