Fix corrupted answers in answerbench_v2.csv

[rootkiller6788]

Summary

Fixes the two data corruptions reported in #14 in imobench/answerbench_v2.csv.

Changes

1. imo-bench-geometry-004 — the Short Answer was 45752, which is not a valid answer to "find the value of n". Restored to "4, 5" (n = 4 or n = 5), matching answerbench.csv (v1).
2. imo-bench-number_theory-048 — the inequality in the Short Answer was flipped to ab \leq e^3. Restored to ab \geq e^3, matching answerbench.csv (v1) and the known answer to this Vietnam 1997 problem (ab ≥ e³).

Verification

• Both v1 (answerbench.csv) and v2 (answerbench_v2.csv) agree on every other field for these two rows; only these two answer fields differ, and v1 carries the correct values.
• The geometry answer "4, 5" is the standard result (n = 4 or n = 5 cities).
• The number-theory answer ab ≥ e³ matches the published solution (e.g. AoPS thread for this problem).

Diff is two lines changed, one per row.