refactor(gtk4-layer-shell): Rename isSupported() to isProtocolSupported()

-  Rename isSupported() to isProtocolSupported() within package
   gtk4-layer-shell.

pkg/gtk4-layer-shell/src/main.zig

@@ -23,7 +23,7 @@ pub const KeyboardMode = enum(c_uint) {
     on_demand = c.GTK_LAYER_SHELL_KEYBOARD_MODE_ON_DEMAND,
 };
 
-pub fn isSupported() bool {
+pub fn isProtocolSupported() bool {
     return c.gtk_layer_is_supported() != 0;
 }
 

src/apprt/gtk/winproto/wayland.zig

@@ -96,7 +96,7 @@ pub const App = struct {
     }
 
     pub fn supportsQuickTerminal(_: App) bool {
-        if (!layer_shell.isSupported()) {
+        if (!layer_shell.isProtocolSupported()) {
             log.warn("your compositor does not support the wlr-layer-shell protocol; disabling quick terminal", .{});
             return false;
         }