syntactic changes: remove unneeded paths when the type is already imported

cli/app.rs

@@ -337,7 +337,7 @@ impl Limbo {
             .map_err(|e| e.to_string())
     }
 
-    fn display_in_memory(&mut self) -> std::io::Result<()> {
+    fn display_in_memory(&mut self) -> io::Result<()> {
         if self.opts.db_file == ":memory:" {
             self.writeln("Connected to a transient in-memory database.")?;
             self.writeln("Use \".open FILENAME\" to reopen on a persistent database")?;
@@ -345,7 +345,7 @@ impl Limbo {
         Ok(())
     }
 
-    fn show_info(&mut self) -> std::io::Result<()> {
+    fn show_info(&mut self) -> io::Result<()> {
         let opts = format!("{}", self.opts);
         self.writeln(opts)
     }