Use TOP layer instead of OVERLAY on Wayland

Overlay is reserved for lock screens and similar programs.

Fixes #7

Author: lbonn

source/wayland/display.c

@@ -1013,7 +1013,7 @@ wayland_display_setup(GMainLoop *main_loop, NkBindings *bindings)
 
     wayland->bindings_seat = nk_bindings_seat_new ( bindings, XKB_CONTEXT_NO_FLAGS );
 
-    wayland->wlr_surface = zwlr_layer_shell_v1_get_layer_surface(wayland->layer_shell, wayland->surface, NULL, ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY, "rofi");
+    wayland->wlr_surface = zwlr_layer_shell_v1_get_layer_surface(wayland->layer_shell, wayland->surface, NULL, ZWLR_LAYER_SHELL_V1_LAYER_TOP, "rofi");
 
     // ANCHOR_LEFT is needed to get the full screen width
     zwlr_layer_surface_v1_set_anchor( wayland->wlr_surface, ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP | ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT );