Fix revert button #5574

Author: netmindz

wled00/data/update.htm

@@ -151,9 +151,9 @@ <h3>Manual upload</h3>
 		<input type='checkbox' onchange="sV.value=checked?1:''" id="skipValidation">
 		<label for='skipValidation'>Ignore firmware validation</label><br>
 		<button type="submit">Upload</button><br>
-		<span id="rev">
+		<span>
 			<hr class="sml">
-			<button type="button" onclick="cR()">Revert update</button><br>
+			<button id="rev" type="button" onclick="cR()">Revert update</button><br>
 		</span>
 	</div>
 	</form>