Migrate String8|16.setTo to assignment operator

Bug: 295394788
Test: make checkbuild
Change-Id: I370f66c469de73064dec2e42c539dc236dd69d1e
diff --git a/cmds/app_process/app_main.cpp b/cmds/app_process/app_main.cpp
index a040b57..4e41f2c 100644
--- a/cmds/app_process/app_main.cpp
+++ b/cmds/app_process/app_main.cpp
@@ -271,9 +271,9 @@
         } else if (strcmp(arg, "--application") == 0) {
             application = true;
         } else if (strncmp(arg, "--nice-name=", 12) == 0) {
-            niceName.setTo(arg + 12);
+            niceName = (arg + 12);
         } else if (strncmp(arg, "--", 2) != 0) {
-            className.setTo(arg);
+            className = arg;
             break;
         } else {
             --i;