Polish authorization consent page

Issue gh-340

oauth2-authorization-server/src/main/java/org/springframework/security/oauth2/server/authorization/web/OAuth2AuthorizationEndpointFilter.java

@@ -406,7 +406,7 @@ public class OAuth2AuthorizationEndpointFilter extends OncePerRequestFilter {
 			builder.append("                    <button class=\"btn btn-primary btn-lg\" type=\"submit\">Submit Consent</button>");
 			builder.append("                </div>");
 			builder.append("                <div class=\"form-group\">");
-			builder.append("                    <button class=\"btn btn-link regular\" type=\"submit\">Cancel</button>");
+			builder.append("                    <button class=\"btn btn-link regular\" type=\"reset\">Cancel</button>");
 			builder.append("                </div>");
 			builder.append("            </form>");
 			builder.append("        </div>");

samples/boot/oauth2-integration/authorizationserver-custom-consent-page/src/main/resources/templates/consent.html

@@ -64,7 +64,7 @@
                     </button>
                 </div>
                 <div class="form-group">
-                    <button class="btn btn-link regular" type="submit">
+                    <button class="btn btn-link regular" type="reset">
                         Cancel
                     </button>
                 </div>