fix(ssr): enable inlineDynamicImports when input has length 1 (#9904)

Author: jeffydc

packages/vite/src/node/build.ts

@@ -481,7 +481,8 @@ async function doBuild(
         inlineDynamicImports:
           output.format === 'umd' ||
           output.format === 'iife' ||
-          (ssrWorkerBuild && typeof input === 'string'),
+          (ssrWorkerBuild &&
+            (typeof input === 'string' || Object.keys(input).length === 1)),
         ...output
       }
     }