feat(picker): [picker] Adapting to the SMB theme (#2118)

packages/theme/src/picker/index.less

@@ -87,10 +87,13 @@
     width: initial;
     cursor: pointer;
     color: var(--ti-date-editor-input-icon-color-fill);
+    position: absolute;
+    right: 0;
 
     .baseClearicon {
-      margin-right: 8px;
-      fill: #252b3a;
+      position: absolute;
+      fill: #808080;
+      background-color: #FFFFFF;
 
       &:hover {
         fill: var(--ti-input-clear-text-color-hover);

packages/theme/src/picker/vars.less

@@ -16,4 +16,5 @@
   --ti-date-editor-input-small-height: var(--ti-common-line-height-3);
   --ti-date-editor-input-border-color: var(--ti-common-color-line-hover);
   --ti-date-editor-input-icon-color-fill: var(--ti-base-color-common-2);
+  --ti-input-clear-text-color-hover: #191919;
 }