Removed explicit version from shaders and not using new glsl features

imgui-winit-glow-renderer-viewports/src/fragment_shader.glsl

@@ -1,9 +1,7 @@
-#version 450 core
-
 in vec2 v2f_UV;
 in vec4 v2f_Color;
 
-layout(location = 0) uniform sampler2D u_FontTexture;
+uniform sampler2D u_FontTexture;
 
 layout(location = 0) out vec4 out_Color;
 

imgui-winit-glow-renderer-viewports/src/vertex_shader.glsl

@@ -1,5 +1,3 @@
-#version 450
-
 layout(location = 0) in vec2 in_Position;
 layout(location = 1) in vec2 in_UV;
 layout(location = 2) in vec4 in_Color;