Don't try to turn on geiser-mode in non-scheme buffers

xscheme defines its own scheme-interaction-mode that, quite rudely if
you ask me, calls not only its hooks, but also scheme-mode's.  Among
them, turn-on-geiser-mode, causing havoc to users of xscheme's
run-scheme function.

We, ahem, fix this problem by checking that we're actually in
scheme-mode when our hook is called.

Thanks to Federico Beffa for his reports.

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