all: use a !in b instead of !(a in b)

cmd/tools/vfmt.v

@@ -92,7 +92,7 @@ fn main() {
 	}
 	mut cli_args_no_files := []string
 	for a in os.args {
-		if !(a in files) {
+		if a !in files {
 			cli_args_no_files << a
 		}
 	}

cmd/tools/vpm.v

@@ -364,7 +364,7 @@ fn resolve_dependencies(name, module_path string, module_names []string) {
 	mut deps := []string
 	// filter out dependencies that were already specified by the user
 	for d in vmod.deps {
-		if !(d in module_names) {
+		if d !in module_names {
 			deps << d
 		}
 	}