This change updates lk.code-workspace to specify
* editor.detectIndentation as false, as otherwise that overrides
the desired editor.tabSize setting.
* editor.insertSpaces as true, since spaces are preferred over tabs.
* editor.formatOnSave as false for C and C++ files, as - in the absence
of a .clang-format file - the clangd extension is likely to default to
choices that don't respect the local style.
