translate: updated the command to more closely match SQLite semantics

the command for drop table translation has been updated so that it more closely matches the semantics of SQLite's drop table command.

there are a few more things missing like ephemeral tables, destroy etc.

core/vdbe/explain.rs

@@ -1101,8 +1101,8 @@ pub fn insn_to_str(
                 0,
                 format!("r[{}]=root iDb={} flags={}", root, db, flags),
             ),
-            Insn::DropBtree { db, root } => (
-                "DropBtree",
+            Insn::DropTable { db, root } => (
+                "DropTable",
                 *db as i32,
                 *root as i32,
                 0,

core/vdbe/insn.rs

@@ -590,8 +590,8 @@ pub enum Insn {
         flags: usize,
     },
 
-    //  Drop a b-tree
-    DropBtree {
+    //  Drop a table
+    DropTable {
         //  The database within which this b-tree needs to be dropped (P1).
         db: usize,
         //  The root page of this b-tree (P2).

core/vdbe/mod.rs

@@ -2688,7 +2688,7 @@ impl Program {
                     state.registers[*root] = OwnedValue::Integer(root_page as i64);
                     state.pc += 1;
                 }
-                Insn::DropBtree { db, root } => {
+                Insn::DropTable { db, root } => {
                     if *db > 0 {
                         todo!("temp databases not implemented yet");
                     }