Table: fix incorrect expression (#5109)

packages/table/src/table.vue

@@ -6,7 +6,7 @@
       'el-table--border': border,
       'el-table--fluid-height': maxHeight,
       'el-table--enable-row-hover': !store.states.isComplex,
-      'el-table--enable-row-transition': true || (store.states.data || []).length !== 0 && (store.states.data || []).length < 100
+      'el-table--enable-row-transition': (store.states.data || []).length !== 0 && (store.states.data || []).length < 100
     }"
     @mouseleave="handleMouseLeave($event)">
     <div class="hidden-columns" ref="hiddenColumns"><slot></slot></div>