Update utils.jl

Author: wsmoses

examples/utils.jl

@@ -1,5 +1,5 @@
 # EXCLUDE FROM TESTING
-if backend_str == "CUDA" && Base.find_package("CUDA") !== nothing
+if Base.find_package("CUDA") !== nothing
     using CUDA
     using CUDA.CUDAKernels
     const backend = CUDABackend()