fix: export error raw input set to 400

Author: jszuminski

lib/chart.js

@@ -114,7 +114,7 @@ export const startExport = async (settings, endCallback) => {
           );
     } catch (error) {
       return endCallback(
-        new ExportError('[chart] Error loading raw input.').setError(error)
+        new ExportError('[chart] Error loading raw input.', 400).setError(error)
       );
     }
   }