fix(FileUpload): fix broken choose button in basic mode, fixes primef…

…aces#6257, primefaces#5748

This fix removes the initial code for a transformation to an upload button
since the code is incomplete. It also removes the bug that you cannot
perform additional file selections.

packages/primevue/src/fileupload/FileUpload.vue

@@ -70,10 +70,7 @@
             :pt="ptm('pcChooseButton')"
         >
             <template #icon="iconProps">
-                <slot v-if="!hasFiles || auto" name="uploadicon">
-                    <component :is="uploadIcon ? 'span' : 'UploadIcon'" :class="[iconProps.class, uploadIcon]" aria-hidden="true" v-bind="ptm('pcButton')['icon']" />
-                </slot>
-                <slot v-else name="chooseicon">
+                <slot name="chooseicon">
                     <component :is="chooseIcon ? 'span' : 'PlusIcon'" :class="[iconProps.class, chooseIcon]" aria-hidden="true" v-bind="ptm('pcButton')['icon']" />
                 </slot>
             </template>
@@ -83,7 +80,7 @@
                 {{ basicFileChosenLabel }}
             </span>
         </slot>
-        <input v-if="!hasFiles" ref="fileInput" type="file" :accept="accept" :disabled="disabled" :multiple="multiple" @change="onFileSelect" @focus="onFocus" @blur="onBlur" v-bind="ptm('input')" />
+        <input ref="fileInput" type="file" :accept="accept" :disabled="disabled" :multiple="multiple" @change="onFileSelect" @focus="onFocus" @blur="onBlur" v-bind="ptm('input')" />
     </div>
 </template>
 
@@ -120,9 +117,14 @@ export default {
             if (this.hasFiles) this.uploader();
         },
         onBasicUploaderClick(event) {
-            if (event.button === 0 && !this.hasFiles) this.$refs.fileInput.click();
+            if (event.button === 0) this.$refs.fileInput.click();
         },
         onFileSelect(event) {
+            if (this.isBasic && this.hasFiles) {
+                this.files = [];
+                this.messages = null;
+            }
+
             if (event.type !== 'drop' && this.isIE11() && this.duplicateIEEvent) {
                 this.duplicateIEEvent = false;