Revert "Add #version 120 to make shaders work on Windows"

USL-32

This breaks OpenGL shaders on Windows and Mac.

plugins/LayerView/layerview_composite.shader

@@ -1,6 +1,5 @@
 [shaders]
 vertex =
-    #version 120
     uniform highp mat4 u_modelViewProjectionMatrix;
     attribute highp vec4 a_vertex;
     attribute highp vec2 a_uvs;
@@ -14,7 +13,6 @@ vertex =
     }
 
 fragment =
-    #version 120
     uniform sampler2D u_layer0;
     uniform sampler2D u_layer1;
     uniform sampler2D u_layer2;