DROP TABLE: renamed BTreeCusor::btree_drop to BTreeCursor::btree_destroy

this more closely matches semantics

core/storage/btree.rs

@@ -2236,7 +2236,7 @@ impl BTreeCursor {
         Ok(Some(n_overflow))
     }
 
-    pub fn btree_drop(&mut self) -> Result<CursorResult<()>> {
+    pub fn btree_destroy(&mut self) -> Result<CursorResult<()>> {
         self.move_to_root();
 
         loop {

core/vdbe/mod.rs

@@ -2697,7 +2697,7 @@ impl Program {
                         todo!("temp databases not implemented yet.");
                     }
                     let mut cursor = Box::new(BTreeCursor::new(pager.clone(), *root));
-                    cursor.btree_drop()?;
+                    cursor.btree_destroy()?;
                     state.pc += 1;
                 }
                 Insn::DropTable { db, root: _ } => {