Fix more procedure to be contextless

tests/core/flags/test_core_flags.odin

@@ -17,7 +17,7 @@ Custom_Data :: struct {
 }
 
 @(init)
-init_custom_type_setter :: proc() {
+init_custom_type_setter :: proc "contextless" () {
 	// NOTE: This is done here so it can be out of the flow of the
 	// multi-threaded test runner, to prevent any data races that could be
 	// reported by using `-sanitize:thread`.

tests/core/normal.odin

@@ -2,10 +2,10 @@ package tests_core
 
 import rlibc "core:c/libc"
 
-@(init)
+@(init="contextless")
 download_assets :: proc() {
 	if rlibc.system("python3 " + ODIN_ROOT + "tests/core/download_assets.py " + ODIN_ROOT + "tests/core/assets") != 0 {
-		panic("downloading test assets failed!")
+		panic_contextless("downloading test assets failed!")
 	}
 }