fix: Remove ':' key hardcoded binding for command mode

src/main_ncurses.cpp

@@ -716,7 +716,7 @@ private:
         }
         
         // Command mode
-        if (key_name == "M-x" || key_name == ":") {
+        if (key_name == "M-x") {
             mode_ = Mode::Command;
             command_buffer_.clear();
             return true;