Fixed SIFT on CPU backend when double_input is false
Fixed SIFT on CPU backend when double_input is false

ghisvail/arrayfire,pentschev/arrayfire,munnybearz/arrayfire,arrayfire/arrayfire,pentschev/arrayfire,hshindo/arrayfire,victorv/arrayfire,ghisvail/arrayfire,bkloppenborg/arrayfire,umar456/arrayfire,victorv/arrayfire,merlin-ext/arrayfire,victorv/arrayfire,marbre/arrayfire,merlin-ext/arrayfire,9prady9/arrayfire,hshindo/arrayfire,umar456/arrayfire,munnybearz/arrayfire,bkloppenborg/arrayfire,pentschev/arrayfire,9prady9/arrayfire,arrayfire/arrayfire,shehzan10/arrayfire,merlin-ext/arrayfire,ghisvail/arrayfire,marbre/arrayfire,ghisvail/arrayfire,marbre/arrayfire,merlin-ext/arrayfire,hshindo/arrayfire,bkloppenborg/arrayfire,pentschev/arrayfire,munnybearz/arrayfire,umar456/arrayfire,9prady9/arrayfire,shehzan10/arrayfire,hshindo/arrayfire,victorv/arrayfire,9prady9/arrayfire,shehzan10/arrayfire,arrayfire/arrayfire,shehzan10/arrayfire,arrayfire/arrayfire,bkloppenborg/arrayfire,marbre/arrayfire,umar456/arrayfire