Fix float(::Type) test

Author: MilesCranmer

test/unittests.jl

@@ -443,7 +443,7 @@ end
     x = Quantity{Int}(u"m/s")
     @test typeof(x) == Quantity{Int64,DEFAULT_DIM_TYPE}
     y = float(typeof(x))
-    @test typeof(y) == Quantity{Float64,DEFAULT_DIM_TYPE}
+    @test y == Quantity{Float64,DEFAULT_DIM_TYPE}
 end
 
 @testset "Units" begin