Restrict StreamFileProvider paths to only used directories (#6183)

Co-authored-by: Claude <noreply@anthropic.com>

Author: VelikovPetar

stream-chat-android-ui-common/src/main/res/xml/stream_filepaths.xml

@@ -15,28 +15,16 @@
     limitations under the License.
 -->
 <paths>
-    <files-path
-        name="files"
-        path="."
-        />
     <cache-path
         name="cache"
         path="."
         />
-    <external-path
-        name="external"
-        path="."
-        />
     <external-files-path
-        name="external_files"
-        path="."
+        name="external_pictures"
+        path="Pictures/"
         />
-    <external-cache-path
-        name="external_cache"
-        path="."
-        />
-    <external-media-path
-        name="external_media"
-        path="."
+    <external-files-path
+        name="external_movies"
+        path="Movies/"
         />
 </paths>