fix: Update prompt path after return from REPL (#88)
fix: Update prompt path after return from REPL (#88)

* fix: Update prompt path after return from REPL

When returning from REPL the file explorer is reinitialized since
filesystem contents on the board may have changed. This also means that
the current directory has been reset to /. Update prompt path to display
the new path.

* Restore current path after REPL

Without this change, the device will be in the root directory after
REPL. Store the current path before going into REPL and try to cd back
into that path after.

wendlers/mpfshell