Fix warnings when compiling with GCC 7

src/screens/browser.cpp

@@ -153,10 +153,8 @@ void Browser::resize()
 	{
 		case DisplayMode::Columns:
 			if (Config.titles_visibility)
-			{
 				w.setTitle(Display::Columns(w.getWidth()));
 			break;
-			}
 		case DisplayMode::Classic:
 			w.setTitle("");
 			break;

src/screens/playlist.cpp

@@ -95,12 +95,11 @@ void Playlist::resize()
 	{
 		case DisplayMode::Columns:
 			if (Config.titles_visibility)
-			{
 				w.setTitle(Display::Columns(w.getWidth()));
 			break;
-			}
 		case DisplayMode::Classic:
 			w.setTitle("");
+			break;
 	}
 
 	hasToBeResized = 0;

src/screens/search_engine.cpp

@@ -194,12 +194,11 @@ void SearchEngine::resize()
 	{
 		case DisplayMode::Columns:
 			if (Config.titles_visibility)
-			{
 				w.setTitle(Display::Columns(w.getWidth()));
 			break;
-			}
 		case DisplayMode::Classic:
 			w.setTitle("");
+			break;
 	}
 	hasToBeResized = 0;
 }