修改网页端，预算因toFixed出现的无法选择bug

oa-ui/src/views/flowable/form/budget/carTable.vue

           </tr>
           <tr>
             <td colspan="8">车辆成本合计</td>
-            <td>{{ form.carCost ? form.carCost.toFixed(2) : '0.00' }}</td>
+            <td>{{ form.carCost }}</td>
           </tr>
         </table>
       </el-form-item>
       for (let car of this.chooseCar) {
         carCost = carCost + Number(car.expense);
       }
-      this.form.carCost = carCost
+      this.form.carCost = carCost.toFixed(2)
     },
     getChooseCar(val) {
       this.chooseCar = val;

oa-ui/src/views/flowable/form/budget/deviceTable.vue

           </tr>
           <tr>
             <td colspan="5">设备成本合计</td>
-            <td>{{ form.deviceCost ? form.deviceCost.toFixed(2) : '0.00' }}</td>
+            <td>{{ form.deviceCost }}</td>
           </tr>
         </table>
       </el-form-item>
       for (let device of this.chooseDevice) {
         deviceCost = deviceCost + Number(device.depreciation);
       }
-      this.form.deviceCost = deviceCost
+      this.form.deviceCost = deviceCost.toFixed(2)
     },
     getChooseDevice(val) {
       this.chooseDevice = val;

oa-ui/src/views/flowable/form/budget/staffTable.vue

           </tr>
           <tr>
             <td colspan="4">人员成本合计</td>
-            <td>{{ form.staffCost ? form.staffCost.toFixed(2) : '0.00' }}</td>
+            <td>{{ form.staffCost }}</td>
           </tr>
         </table>
       </el-form-item>
       for (let user of this.chooseUser) {
         staffCost = staffCost + Number(user.staffCost);
       }
-      this.form.staffCost = staffCost
+      this.form.staffCost = staffCost.toFixed(2)
     },
     getChooseUser(val) {
       for (let v of val) {