Fix markup of file names in file picker

Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>

core/templates/filepicker.html

@@ -47,7 +47,7 @@
 						<span class="filename-parts">
 							<span class="filename-parts__first">{filename1}</span>
 							<span class="filename-parts__last">{filename2}</span>
-						</div>
+						</span>
 					</td>
 					<td class="filesize"
 						style="color:rgb({sizeColor}, {sizeColor}, {sizeColor})">