egui_glow: update example to latest glutin (#2396)

This lifts the context handling from commit hash 8eb687c as this does
all the required handling for us that the older glutin once did.

Cargo.lock

@@ -1306,7 +1306,7 @@ dependencies = [
  "egui-winit",
  "egui_glow",
  "glow",
- "glutin 0.30.0",
+ "glutin 0.30.2",
  "image",
  "js-sys",
  "percent-encoding",
@@ -1445,9 +1445,10 @@ dependencies = [
  "egui",
  "egui-winit",
  "glow",
- "glutin 0.29.1",
+ "glutin 0.30.2",
  "memoffset",
  "puffin",
+ "raw-window-handle 0.5.0",
  "tracing",
  "wasm-bindgen",
  "web-sys",
@@ -1969,23 +1970,23 @@ dependencies = [
 
 [[package]]
 name = "glutin"
-version = "0.30.0"
+version = "0.30.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "34acbf502536f1d125f0fc09b6ad8824e93e6da7b99e86d3383e6b8310ba3554"
+checksum = "0282c380a3adb52ae095e5847cc575c6bf79d296dcbf333e00be4a3fca07235e"
 dependencies = [
  "bitflags",
  "cfg_aliases",
  "cgl",
  "cocoa",
  "core-foundation",
- "glutin_egl_sys 0.3.0",
+ "glutin_egl_sys 0.3.1",
  "glutin_glx_sys 0.3.0",
  "glutin_wgl_sys 0.3.0",
  "libloading",
  "objc",
  "once_cell",
  "raw-window-handle 0.5.0",
- "wayland-sys 0.30.0-beta.12",
+ "wayland-sys 0.30.0",
  "windows-sys 0.36.1",
  "x11-dl",
 ]
@@ -2002,9 +2003,9 @@ dependencies = [
 
 [[package]]
 name = "glutin_egl_sys"
-version = "0.3.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2c3c95a2d7a54bab0c74759794efb5cd63470d4504cbe85ed4114dc82c98bdc1"
+checksum = "3adbb8fec0e18e340f990c78f79f5f0e142d0d83f46b10909aaa7d251c00afdf"
 dependencies = [
  "gl_generator",
  "windows-sys 0.36.1",
@@ -4460,9 +4461,9 @@ dependencies = [
 
 [[package]]
 name = "wayland-sys"
-version = "0.30.0-beta.12"
+version = "0.30.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1117fe4570fe063122ba2b1b1e39e56fb1a73921d395f9288af06af0dd1c7f55"
+checksum = "8bcdbc325d8a78a9f49dcb77b39e92656e93b3f69eb4d60245f2116ec4bb0a97"
 dependencies = [
  "dlib",
  "lazy_static",