userspace: remove vendor_boot selection logic

- Only patch it when user actively selects vendor_boot.

userspace/ksud/src/boot_patch.rs

@@ -690,10 +690,7 @@ pub fn choose_boot_partition(
 ) -> String {
     let slot_suffix = get_slot_suffix(false);
     let skip_init_boot = kmi.starts_with("android12-");
-
     let init_boot_exist = Path::new(&format!("/dev/block/by-name/init_boot{slot_suffix}")).exists();
-    let vendor_boot_exist =
-        Path::new(&format!("/dev/block/by-name/vendor_boot{slot_suffix}")).exists();
 
     // if specific partition is specified, use it
     if let Some(part) = partition {
@@ -708,11 +705,6 @@ pub fn choose_boot_partition(
         return "init_boot".to_string();
     }
 
-    // if vendor_boot exists and not skipping it, use it
-    if !is_replace_kernel && vendor_boot_exist && !skip_init_boot {
-        return "vendor_boot".to_string();
-    }
-
     "boot".to_string()
 }