Clean up vertex inputs

Fixes #766

data/shaders/glsl/offscreen/mirror.frag

@@ -2,8 +2,7 @@
 
 layout (binding = 1) uniform sampler2D samplerColor;
 
-layout (location = 0) in vec2 inUV;
-layout (location = 1) in vec4 inPos;
+layout (location = 0) in vec4 inPos;
 
 layout (location = 0) out vec4 outFragColor;
 

data/shaders/glsl/offscreen/mirror.vert

@@ -1,7 +1,6 @@
 #version 450
 
 layout (location = 0) in vec3 inPos;
-layout (location = 1) in vec2 inUV;
 
 layout (binding = 0) uniform UBO 
 {
@@ -10,12 +9,10 @@ layout (binding = 0) uniform UBO
 	mat4 model;
 } ubo;
 
-layout (location = 0) out vec2 outUV;
-layout (location = 1) out vec4 outPos;
+layout (location = 0) out vec4 outPos;
 
 void main() 
 {
-	outUV = inUV;
 	outPos = ubo.projection * ubo.view * ubo.model * vec4(inPos.xyz, 1.0);
 	gl_Position = outPos;		
 }