Fixed compilation after rebase

src/ui/app.rs

src/ui/panes.rs

src/ui/panes/pid_drawing_tool.rs

src/ui/panes/pid_drawing_tool/connections.rs

src/ui/panes/pid_drawing_tool/elements.rs

src/ui/panes/pid_drawing_tool/grid.rs

src/ui/panes/pid_drawing_tool/symbols.rs