Fix expected line number in TestRunner.py.

llvmGH-73541 added lines to
llvm/utils/lit/tests/Inputs/testrunner-custom-parsers/test.txt
so what was previously on line 7 is now on line 12.

Author: StephanTLavavej

llvm/utils/lit/tests/unit/TestRunner.py

@@ -132,7 +132,7 @@ def test_commands(self):
         value = cmd_parser.getValue()
         self.assertEqual(len(value), 2)  # there are only two run lines
         self.assertEqual(value[0].command.strip(), "%dbg(MY_RUN: at line 4)  baz")
-        self.assertEqual(value[1].command.strip(), "%dbg(MY_RUN: at line 7)  foo  bar")
+        self.assertEqual(value[1].command.strip(), "%dbg(MY_RUN: at line 12)  foo  bar")
 
     def test_boolean(self):
         parsers = self.make_parsers()