shader compiler: Ensure all clip distances are initialized when used

Thank you to Ryujinx (riperiperi specifically) for the pointer towards clip distances
Huge thanks to crueter for finding where the code works and Camille for giving pointers along the way.

src/shader_recompiler/backend/spirv/emit_spirv_special.cpp

@@ -108,7 +108,7 @@ void EmitPrologue(EmitContext& ctx) {
                 ctx.OpStore(element_info.id, value);
                 element += num;
             }
-        }
+        }        
     }
     if (ctx.stage == Stage::VertexB || ctx.stage == Stage::Geometry) {
         SetFixedPipelinePointSize(ctx);