Changing name of flash super layout

OptimizedFlashSuper makes more sense and is more consistent with
should-optimize-super

Test: m fastboot
Change-Id: I6ceb31144dce591e0a53faec68b932112d9cd360
diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index 30eb7b5..29980af 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -1747,7 +1747,7 @@
         }
         tasks.emplace_back(std::move(task));
     }
-    if (auto flash_super_task = FlashSuperLayoutTask::InitializeFromTasks(fp, tasks)) {
+    if (auto flash_super_task = OptimizedFlashSuperTask::InitializeFromTasks(fp, tasks)) {
         auto it = tasks.begin();
         for (size_t i = 0; i < tasks.size(); i++) {
             if (auto flash_task = tasks[i]->AsFlashTask()) {
@@ -1849,7 +1849,7 @@
     std::vector<std::unique_ptr<Task>> tasks;
     AddFlashTasks(boot_images_, tasks);
 
-    if (auto flash_super_task = FlashSuperLayoutTask::Initialize(fp_, os_images_)) {
+    if (auto flash_super_task = OptimizedFlashSuperTask::Initialize(fp_, os_images_)) {
         tasks.emplace_back(std::move(flash_super_task));
     } else {
         // Sync the super partition. This will reboot to userspace fastboot if needed.
@@ -2205,8 +2205,9 @@
                                       {0, 0, 0, 0}};
 
     serial = getenv("FASTBOOT_DEVICE");
-    if (!serial)
+    if (!serial) {
         serial = getenv("ANDROID_SERIAL");
+    }
 
     int c;
     while ((c = getopt_long(argc, argv, "a::hls:S:vw", longopts, &longindex)) != -1) {