fix: The similarity of knowledge base mixed retrieval should be 0-2 (#3021)

Author: shaohuzhang1

ui/src/views/application/component/ParamSettingDialog.vue

@@ -81,7 +81,7 @@
                 <el-input-number
                   v-model="form.dataset_setting.similarity"
                   :min="0"
-                  :max="form.search_mode === 'blend' ? 2 : 1"
+                  :max="form.dataset_setting.search_mode === 'blend' ? 2 : 1"
                   :precision="3"
                   :step="0.1"
                   :value-on-clear="0"