fix opengl errors on raspberry (#2478)

Author: eruvanos

arcade/resources/system/shaders/sprites/sprite_list_geometry_cull_geo.glsl

@@ -64,7 +64,7 @@ void main() {
     //     0.0, 1.0,
     //     1.0, 1.0
     // )
-    vec2 hp = 0.5 / textureSize(sprite_texture, 0) * uv_offset_bias;
+    vec2 hp = 0.5 / vec2(textureSize(sprite_texture, 0)) * uv_offset_bias;
     uv0 += hp;
     uv1 += vec2(-hp.x, hp.y);
     uv2 += vec2(hp.x, -hp.y);

arcade/resources/system/shaders/sprites/sprite_list_geometry_no_cull_geo.glsl

@@ -51,7 +51,7 @@ void main() {
     //     0.0, 1.0,
     //     1.0, 1.0
     // )
-    vec2 hp = 0.5 / textureSize(sprite_texture, 0) * uv_offset_bias;
+    vec2 hp = 0.5 / vec2(textureSize(sprite_texture, 0)) * uv_offset_bias;
     uv0 += hp;
     uv1 += vec2(-hp.x, hp.y);
     uv2 += vec2(hp.x, -hp.y);