Run test_metadce_minimal in STRICT mode. NFC (emscripten-core#21438)

Author: sbc100

test/other/metadce/test_metadce_minimal_O0.gzsize

@@ -1 +1 @@
-7177
+6845

test/other/metadce/test_metadce_minimal_O0.jssize

@@ -1 +1 @@
-19537
+18753

test/test_other.py

@@ -8441,7 +8441,8 @@ def strip_numeric_suffixes(funcname):
     'wasmfs': (['-Oz', '-sWASMFS'], [], []), # noqa
   })
   def test_metadce_minimal(self, *args):
-    self.set_setting('INCOMING_MODULE_JS_API', [])
+    self.set_setting('STRICT')
+    self.emcc_args.append('--no-entry')
     self.run_metadce_test('minimal.c', *args)
 
   @node_pthreads