[lldb][Windows] TestLinuxCore.LinuxCoreTestCase.test_object_map failed after #197341

The `TestLinuxCore.LinuxCoreTestCase.test_object_map` test failed on Windows after #197341.
[lldb-remote-linux-win](https://lab.llvm.org/buildbot/#/builders/197/builds/15972), [lldb-x86_64-win](https://lab.llvm.org/buildbot/#/builders/211/builds/8143)
```
# Copy linux-i386.out to lldb_i386_object_map/a.out
tmp_object_map_root = os.path.join(self.getBuildDir(), "lldb_i386_object_map")
executable = os.path.join(tmp_object_map_root, "a.out")
lldbutil.mkdir_p(os.path.dirname(executable))
shutil.copyfile("linux-i386.out", executable)

# Replace the original module path at /home/labath/test and load the core
self.runCmd("settings set target.object-map /home/labath/test {}".format(tmp_object_map_root))

target = self.dbg.CreateTarget(None)
process = target.LoadCore("linux-i386.core")

# Check that we did load the mapped executable
exe_module_spec = process.GetTarget().GetModuleAtIndex(0).GetFileSpec()
self.assertTrue(exe_module_spec.fullpath.startswith(tmp_object_map_root))
```
```
File "C:\buildbot\as-builder-10\lldb-x86-64\llvm-project\lldb\test\API\functionalities\postmortem\elf-core\TestLinuxCore.py", line 345, in test_object_map
self.assertTrue(exe_module_spec.fullpath.startswith(tmp_object_map_root))
AssertionError: False is not true
```
The values on Windows are:
exe_module_spec = /home/labath/test/a.out
tmp_object_map_root = D:\build-dir\lldb-test-build.noindex\functionalities\postmortem\elf-core\TestLinuxCore\lldb_i386_object_map

This test is disabled for Windows hosts for now.

Start with lldb/test/API/functionalities/postmortem/elf-core/TestLinuxCore.py and the test_object_map method, then review the linked Windows buildbot failures and the target.object-map setup. Reproduce the test on a Windows host and trace why the mapped executable remains /home/labath/test/a.out. Done means the test recognizes the mapped executable under its temporary Windows path and can be enabled again for Windows hosts.

Written by the indexing model from the issue text.