Remove XTIMEOUT from TestExitDuringStep on linux

The test has passed last 200 buildbot runs, so it's hopefully working now. I'll watch buildbots
for signs of trouble.

llvm-svn: 256746

lldb/packages/Python/lldbsuite/test/dosep.py

@@ -1147,7 +1147,6 @@ def getExpectedTimeouts(platform_name):
     if target.startswith("linux"):
         expected_timeout |= {
             "TestEvents.py",
-            "TestExitDuringStep.py",
 
             # Times out in ~10% of the times on the build bot
             "TestHelloWorld.py",