fix: restore exact total_ms check instead of endsWith

Author: johnathan79717

bench/index.html

@@ -800,7 +800,7 @@
             const datasets = sorted.map((item, i) => {
               const color = colors[i % colors.length];
               const metricName = item.fullKey.split("/").pop();
-              const isTotal = metricName.endsWith("total_ms");
+              const isTotal = metricName === "total_ms";
               const valueMap = new Map();
               item.benches.forEach((entry) => {
                 valueMap.set(entry.commit.id, entry.bench.value);