[test] Remove redundant setting in test_minimal_runtime_code_size. NFC (#20893)

This setting already defaults to zero.  Removing it make fewer false
positives show up when searching for uses of this settings.

Author: sbc100

test/test_other.py

@@ -10488,7 +10488,6 @@ def test_minimal_runtime_code_size(self, test_name, js, compare_js_output=False)
                                '-sGL_SUPPORT_AUTOMATIC_ENABLE_EXTENSIONS=0',
                                '-sGL_SUPPORT_SIMPLE_ENABLE_EXTENSIONS=0',
                                '-sGL_TRACK_ERRORS=0',
-                               '-sGL_SUPPORT_EXPLICIT_SWAP_CONTROL=0',
                                '-sGL_POOL_TEMP_BUFFERS=0',
                                '-sGL_WORKAROUND_SAFARI_GETCONTEXT_BUG=0',
                                '-sNO_FILESYSTEM',