refactor(timetable.js): Only validate arrival or depature time columns (more strict check)

Author: philip-cline

lib/editor/selectors/timetable.js

@@ -150,7 +150,7 @@ const isCellValueInvalid = (
       let previousValue = null
       let previousIndex = colIndex - 1
       // Find previous stop time
-      while (previousValue === null && previousIndex >= 0 && columns[previousIndex].type !== 'TEXT') {
+      while (previousValue === null && previousIndex >= 0 && (columns[previousIndex].type === 'ARRIVAL_TIME' || columns[previousIndex].type === 'DEPARTURE_TIME')) {
         const previousCol = columns[previousIndex]
         previousValue = previousCol && row && objectPath.get(row, previousCol.key)
         previousIndex--