adjust error message of zig run with no args
adjust error message of zig run with no args

previously it said "one source file" which was not correct

zig-lang/zig,andrewrk/zig,raulgrell/zig,raulgrell/zig,andrewrk/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig,raulgrell/zig,zig-lang/zig