[3.13] Revert use of --rerun in iOS testbed. (#122995)

Reverts the use of --rerun in iOS testing because it tries to create a subprocess on the rerun.

Author: freakboy3742

iOS/testbed/iOSTestbedTests/iOSTestbedTests.m

@@ -15,7 +15,6 @@ - (void)testPython {
     const char *argv[] = {
         "iOSTestbed", // argv[0] is the process that is running.
         "-uall",  // Enable all resources
-        "--rerun",  // Re-run failed tests in verbose mode
         "-W",  // Display test output on failure
         // To run a subset of tests, add the test names below; e.g.,
         // "test_os",