fix(box): use canonical param ID for file normalization in params()

The params function must reference canonical IDs (params.file), not raw
subBlock IDs (uploadFile/fileRef) which are deleted after canonical
transformation. Matches the Dropbox block pattern.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/sim/blocks/blocks/box.ts

@@ -273,9 +273,7 @@ export const BoxBlock: BlockConfig = {
     config: {
       tool: (params) => `box_${params.operation}`,
       params: (params) => {
-        const normalizedFile = normalizeFileInput(params.uploadFile || params.fileRef, {
-          single: true,
-        })
+        const normalizedFile = normalizeFileInput(params.file, { single: true })
         if (normalizedFile) {
           params.file = normalizedFile
         }