fix: Crash when calling ui::display::sync

Makefile

 CFLAGS += -march=native -masm=intel -g -Og -fsanitize=address,signed-integer-overflow,undefined -pedantic -Wall -Wextra -Werror -Wduplicated-cond -Wduplicated-branches -Wlogical-op -Wrestrict -Wnull-dereference -Wdouble-promotion -Wshadow -Wformat=2 -Wfloat-equal -Wundef -Wpointer-arith -Wcast-align -Wstrict-overflow=5 -Wwrite-strings -Wswitch-default -Wswitch-enum -Wconversion -Wunreachable-code -Winit-self -fno-strict-aliasing -Wno-unknown-warning-option
-CXXFLAGS += ${CFLAGS} -std=c++11 -std=c++17 -Wuseless-cast -Weffc++ -I/usr/local/include
+CXXFLAGS += ${CFLAGS} -std=c++11 -std=c++17 -Wuseless-cast -Weffc++ -I/usr/local/include -Wno-non-virtual-dtor
 DEPFLAGS = -MT $@ -MMD -MP -MF $(patsubst ${OBJDIR}/%.o,${DEPDIR}/%.d,$@)
 
 PODOMAIN ?= rmrf

src/ui/display.cpp

+#include "ui/display.hpp"
+
 #include "lib/ncurses/ncurses.hpp"
 
 #include "ui/view.hpp"

src/ui/display.hpp

@@ -15,7 +15,7 @@ namespace rmrf::ui {
  * It implements some basic information handling and a registry for
  * views.
  */
-class display : std::enable_shared_from_this<display> {
+class display : public std::enable_shared_from_this<display> {
 public:
     typedef display self_type;
     typedef std::shared_ptr<self_type> ptr_type;