[MM-63027] Allow results to be read on filter without search term (#33625)

* [MM-63027] Allow results to be read on filter without search term

* Fix snap

webapp/channels/src/components/__snapshots__/searchable_channel_list.test.tsx.snap

@@ -34,6 +34,13 @@ exports[`components/SearchableChannelList should match init snapshot 1`] = `
     >
       0 Results
     </span>
+    <span
+      aria-live="polite"
+      className="sr-only"
+      role="status"
+    >
+      0 Results
+    </span>
     <div
       id="modalPreferenceContainer"
     >

webapp/channels/src/components/searchable_channel_list.tsx

@@ -594,15 +594,13 @@ export class SearchableChannelList extends React.PureComponent<Props, State> {
         const dropDownContainer = (
             <div className='more-modal__dropdown'>
                 <span id='channelCountLabel'>{channelCountLabel}</span>
-                {this.props.isSearch &&
-                    <span
-                        className='sr-only'
-                        role='status'
-                        aria-live='polite'
-                    >
-                        {channelCountLabel}
-                    </span>
-                }
+                <span
+                    className='sr-only'
+                    role='status'
+                    aria-live='polite'
+                >
+                    {channelCountLabel}
+                </span>
                 <div id='modalPreferenceContainer'>
                     {channelDropdown}
                     {hideJoinedPreferenceCheckbox}