test: revert two method signatures the encoding sed pass over-matched

Greptile caught that the bulk encoding pass matched the 'open(' substring
inside the method names test_cache_busted_on_form_open(self) and
test_cache_not_guarded_by_if_on_open(self), injecting encoding="utf-8" into
their signatures. Harmless (pytest ignores the extra default param, so they
passed) but wrong. Restore the original (self) signatures. Verified this was
the only over-match in the commit; all other insertions are clean file reads.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/test_batch_fixes.py

@@ -80,7 +80,7 @@ class TestCronSkillCacheInvalidation:
     def _panels_src(self):
         return read("static/panels.js")
 
-    def test_cache_busted_on_form_open(self, encoding="utf-8"):
+    def test_cache_busted_on_form_open(self):
         src = self._panels_src()
         # toggleCronForm should set cache to null unconditionally
         # openCronCreate() opens the task create form (renamed from toggleCronForm
@@ -94,7 +94,7 @@ class TestCronSkillCacheInvalidation:
             "before fetching skills"
         )
 
-    def test_cache_not_guarded_by_if_on_open(self, encoding="utf-8"):
+    def test_cache_not_guarded_by_if_on_open(self):
         src = self._panels_src()
         # openCronCreate must not gate the fetch behind an if(!_cronSkillsCache) guard.
         m = re.search(