[E-ACSL] fix bug when computing RTEs on the EACSL's resulting project

src/plugins/e-acsl/TODO

src/plugins/e-acsl/doc/Changelog

src/plugins/e-acsl/main.ml

...ins/e-acsl/tests/e-acsl-runtime/oracle/arith.1.res.oracle

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src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_bts1398.c

...plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_bts13982.c

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