fix:修改代客录单（渠道/个代）搜索问题

src/views/Task/DaikeLetter.vue

@@ -17,6 +17,11 @@
                 maxlength="17"
                 type="text"
                 show-word-limit
+                @change="() => {
+                  salespersonForm.name = ''
+                  salespersonForm.mobile = ''
+                  salespersonForm.identity = ''
+                }"
               >
                 <el-button
                   slot="append"
@@ -35,6 +40,11 @@
                 v-model="salespersonForm.name"
                 type="text"
                 show-word-limit
+                @change="() => {
+                  salespersonForm.userId = ''
+                  salespersonForm.mobile = ''
+                  salespersonForm.identity = ''
+                }"
               >
                 <el-button
                   slot="append"