[lldb] Fix TestTargetAPI.py on Apple simulators

This test checks that the output of SBTarget.GetDescription() contains the
substrings 'a.out', 'Target', 'Module', 'Breakpoint' in that order. This test
is currently failing on Apple simulators as apparently 'Module' can't be found
in the output after 'Target".

The reason for that is that the actual output of SBTarget.GetDescription() looks like this:

Target
  Module /build/path/lldb-test-build.noindex/python_api/target/TestTargetAPI.test_get_description_dwarf/a.out
0x7ff2b6d3f990:     ObjectFileMachO64, file = /build/path/lldb-test-build.noindex/python_api/target/TestTargetAPI.test_get_description
[...]
0x7ff307150000:   BreakpointList with 0 Breakpoints:
<LLDB module output repeats for each loaded module>

Clearly the string order should be 'Target', 'Module', 'a.out', 'Breakpoint'.
However, LLDB is also a bunch of system shared libraries (libxpc.dylib,
libobjc.A.dylib, etc.) when *not* running against a simulator, we end up
unintentionally finding the 'Target', 'Module', 'Breakpoint' substrings in the
trailing descriptions of the system modules. When running against a simulator we
however don't load shared system libraries.

This patch just moves the substrings in the correct order to make this test pass
without having any shared library modules in the description output.

Reviewed By: JDevlieghere

Differential Revision: https://reviews.llvm.org/D89698