[windowDimmer] Bump GLSL version to 1.10

The shader currently forces GLSL 1.0 to avoid being incompatible with older hardware but is still using features not available in 1.0.

Strict compilers fail to compile the shader:

error C7506: OpenGL/ES does not define the global variable gl_TexCoord

As every hardware/driver that supports 1.0 also supports 1.10 bumping the version to fix it is safe.

https://bugzilla.gnome.org/show_bug.cgi?id=629343

data/shaders/dim-window.glsl

@@ -1,4 +1,4 @@
-#version 100
+#version 110
 uniform sampler2D sampler0;
 uniform float fraction;
 uniform float height;