Remove deprecated App::is_mobile/is_tablet - replace with DI::mode()->isMobile()/isTablet()

rendertime/rendertime.php

@@ -38,7 +38,7 @@ function rendertime_page_end(Friendica\App $a, &$o)
 	$ignored_modules = ["fbrowser"];
 	$ignored = in_array($a->module, $ignored_modules);
 
-	if (is_site_admin() && (($_GET['mode'] ?? '') != 'minimal') && !$a->is_mobile && !$a->is_tablet && !$ignored) {
+	if (is_site_admin() && (($_GET['mode'] ?? '') != 'minimal') && !DI::mode()->isMobile() && !DI::mode()->isMobile() && !$ignored) {
 
 		$o = $o . '<div class="renderinfo">' . L10n::t("Database: %s/%s, Network: %s, Rendering: %s, Session: %s, I/O: %s, Other: %s, Total: %s",
 				round($profiler->get('database') - $profiler->get('database_write'), 3),

smileybutton/smileybutton.php

@@ -33,7 +33,7 @@ function show_button(Friendica\App $a, &$b) {
 		return;
 
 	// Disable for mobile because most mobiles have a smiley key for ther own
-	if ($a->is_mobile || $a->is_tablet)
+	if (DI::mode()->isMobile() || DI::mode()->isMobile())
 		return;
 
 	/**

xmpp/xmpp.php

@@ -143,7 +143,7 @@ function xmpp_converse(App $a)
 		return;
 	}
 
-	if ($a->is_mobile || $a->is_tablet) {
+	if (DI::mode()->isMobile() || DI::mode()->isMobile()) {
 		return;
 	}