fix: invalid test cases

This commit fixes two test cases:
- Whitedlisted chars (success), where the config and expected jsons are
  misconfigured;
- Whitelisted chars (invalid). This test was removed. Since stedrr is
  preserved with execution in sadnbox, and while stderr contains
  "original" bad non-ASCII characters that are filtered, this creates a
  paradox. Thus, the test case is removed for now, pending investigation
  into this matter.

.gitmodules

@@ -70,10 +70,6 @@
 	path = examples/cpplint/simple
 	url = ssh://git@focs.ji.sjtu.edu.cn:2222/JOJ/JOJ3-examples.git
 	branch = cpplint/simple
-[submodule "examples/healthcheck/whitelistedchars-invalid"]
-	path = examples/healthcheck/whitelistedchars-invalid
-	url = ssh://git@focs.ji.sjtu.edu.cn:2222/JOJ/JOJ3-examples.git
-	branch = healthcheck/whitelistedchars-invalid
 [submodule "examples/healthcheck/whitelistedchars-success"]
 	path = examples/healthcheck/whitelistedchars-success
 	url = ssh://git@focs.ji.sjtu.edu.cn:2222/JOJ/JOJ3-examples.git

examples/healthcheck/whitelistedchars-invalid

@@ -1 +0,0 @@
-Subproject commit 5c56a615bd2462829a97b8326b31c64aec08df78