pyhoca-gui.spec: make sure that we enable Python 3 support on ALP, Tumbleweed and OpenSuSE Leap 15.4+.

Python-2-variants don't have the concept of __pycache__ directories at
all, so using %pycache_only there is redundant.

Python-3-variants sprinkle __pycache__ directories wherever there are
.py files, which means that they are conveniently contained in the
"pyhoca" subdirectory of sitelib.

Older *SuSE versions, including Leap, just ignored files or directories
in the %files list that do not exist, but Tumbleweed is throwing an
error if you try to include a file or directory that does not exist.

The fix is easy: don't try to include the non-existent __pycache__
top-level directory.

This reverts commit 269d2258.

pyhoca/wxgui/profilemanager.py: Don't combine wx.ALIGN_RIGHT and wx.EXPAND. wx.EXPAND overrides alignment flags.

pyhoca/wxgui/menus_taskbar.py: Fix AppendMenu wrapper. (All self.AppendMenu implementations lacked a return statement).

pyhoca/wxgui/frontend.py: Fix loading PyHocaGUI_DialogBoxPassphrase from wrong module (passphrase -> logon).

Sadly, only Tumbleweed currently includes python3-wxPython(4), so we
have to keep all other versions on Python 2 for now.

pyhoca-gui.spec: change spelling of python3-wxPython4 to python3-wxpython4 since package names are case-sensitive.

pyhoca-gui.spec: backport build fix from pyhoca-cli: also apply pycache changes to Tumbleweed, which seems to not get caught by %{sle_version}.

pyhoca-gui.spec: backport build fix from pyhoca-cli: actually apply pycache changes to 15.0+ and not just 15.1+.

pyhoca-gui.spec: backport build fix from pyhoca-cli: stage pycache files into a subdir on newer *SuSE versions.

pyhoca-gui.spec: backport build fix from pyhoca-cli: correctly escape bcond_with* macros in comment lines.

Revert "pyhoca-gui.spec: backport *SuSE build fix from pyhoca-cli: make python-devel a build requirement even for Python-3-builds."

This reverts commit f132310c.

pyhoca-gui.spec: backport *SuSE build fix from pyhoca-cli: make python-devel a build requirement even for Python-3-builds.

Use a global variable to store and mangle the Python preferences and
only use %bcond_with... X once later on.