bug#24848: [sh-script] How to save "Local rules set" result from sh-learn-buffer-indent?

[richard.wiseman]

PS When I first load the bash script, if I run smie-config-show-indent on the 
line after "then", I get:

Rules used: :elem basic -> 4, :after "then" -> nil

If I then run smie-config-guess followed by smie-config-show-indent on the same 
line, I now get:

Rules used: :elem basic -> 2(via 4), :after "then" -> nil

If I run smie-config-save (response: "Mode rules replaced in `smie-config'") 
followed by customize-variable smie-config the value is simply:

((2 :elem basic 4))