s/display/draw.

tests/draw_test.c

@@ -1,7 +1,7 @@
 #include <assert.h>
 #include <stdbool.h>
-#include "../src/display.h"
+#include "../src/draw.h"
 
-void test_display() {
+void test_draw() {
   assert(true);
 }

tests/ttysolitaire_test.c

@@ -8,7 +8,7 @@ int main(int argc, const char *argv[]) {
   test_card();
   test_cursor();
   test_deck();
-  test_display();
+  test_draw();
   test_frame();
   test_game();
   test_keyboard();

tests/ttysolitaire_test.h

@@ -4,7 +4,7 @@
 void test_card();
 void test_cursor();
 void test_deck();
-void test_display();
+void test_draw();
 void test_frame();
 void test_game();
 void test_keyboard();