Fix compose keys in French layout bepo variant.

fr(bepo) sends dead_currency with Shift+AltGr+e and
ibus should send currency with dead_currency+dead_currency but
gtkimcontextsimpleseqs.h was not sorted in the descending order
and failed to get dead_currency.
Also need to add dead_stroke and dead_belowcomma for
AltGr+l and Shift+AltGr+Cedilla

BUG=https://code.google.com/p/ibus/issues/detail?id=1742
TEST=src/libibus.so

Review URL: https://codereview.appspot.com/135470043