mksession: restore same :term buf in split windows

Problem: When session-restore creates a terminal buffer with command
         like `:edit term://.//16450:/bin/bash`, the buffer gets
         a different name (depends on PID). Thus the later call to
         `bufexists('term://.//16450:/bin/bash)` will return false.
Solution: Force the buffer name with :file. This as least ensures
         the same buffer will show in multiple windows correctly, as
         expected when saving the session.  But it still has problems:
           1. the PID in the buffer name is bogus
           2. redundant :terminal buffers still hang around

fix #5250

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