deb#905442 apparmor: fix saving files in enforced mode

Add rule to allow creating temporary files like `lu6924jgpjkq.tmp`,
because without it files cannot be saved.

Change-Id: I640897df5d325e2d01da16840034abbd095fb276
Reviewed-on: https://gerrit.libreoffice.org/58672
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>

sysui/desktop/apparmor/program.soffice.bin

@@ -97,6 +97,7 @@ profile libreoffice-soffice INSTDIR-program/soffice.bin {
   owner @{libo_user_dirs}/**/           rw,  #allow creating directories that we own
   owner @{libo_user_dirs}/**~lock.*     rw,  #lock file support
   owner @{libo_user_dirs}/**.@{libreoffice_ext} rwk,  #Open files rw with the right exts
+  owner @{libo_user_dirs}/{,**/}lu??????????{,?}.tmp rwk, #Temporary file used when saving
 
   # Settings
   /etc/libreoffice/                     r,