KUALA LUMPUR, June 5 — The word “economy” in economy rice once had a straightforward meaning.Known to many as geng zai fan — Cantonese for economy rice — the mixed-rice staple built its reputation on affordability, allowing diners to choose according to their budget.Today, however, both customers and operators say the term has taken on a different meaning.Prices have risen, margins have narrowed and competition has intensified, transforming econ…