correct indentation in src/api/c/set.cpp
correct indentation in src/api/c/set.cpp

9prady9/arrayfire,umar456/arrayfire,munnybearz/arrayfire,shehzan10/arrayfire,9prady9/arrayfire,shehzan10/arrayfire,munnybearz/arrayfire,umar456/arrayfire,arrayfire/arrayfire,umar456/arrayfire,arrayfire/arrayfire,9prady9/arrayfire,munnybearz/arrayfire,9prady9/arrayfire,shehzan10/arrayfire,arrayfire/arrayfire,arrayfire/arrayfire,shehzan10/arrayfire,umar456/arrayfire