Clean up demote program write lock feature (backport #21949) (#21969)

* Clean up demote program write lock feature (#21949)

* Clean up demote program write lock feature

* fix test

(cherry picked from commit 6ff0be6a82)

# Conflicts:
#	programs/bpf_loader/src/syscalls.rs
#	runtime/src/accounts.rs

* resolve conflicts

Co-authored-by: Justin Starry <justin@solana.com>

cli-output/src/display.rs

@@ -139,7 +139,7 @@ fn format_account_mode(message: &Message, index: usize) -> String {
         } else {
             "-"
         },
-        if message.is_writable(index, /*demote_program_write_locks=*/ true) {
+        if message.is_writable(index) {
             "w" // comment for consistent rust fmt (no joking; lol)
         } else {
             "-"