fix(microsoft-excel): clear manualDriveId when fileSource changes

Add dependsOn: ['fileSource'] to manualDriveId so its value is cleared
when switching from SharePoint back to OneDrive. Without this, the stale
driveId would still be serialized and forwarded to getItemBasePath,
routing through the SharePoint drive path instead of me/drive.

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

Author: waleedlatif1

apps/sim/blocks/blocks/microsoft_excel.ts

@@ -457,6 +457,7 @@ export const MicrosoftExcelV2Block: BlockConfig<MicrosoftExcelV2Response> = {
       canonicalParamId: 'driveId',
       placeholder: 'Enter the SharePoint drive ID',
       condition: { field: 'fileSource', value: 'sharepoint' },
+      dependsOn: ['fileSource'],
       mode: 'advanced',
     },
     // Manual Spreadsheet ID (advanced mode)