Set result gallery to 2 columns and height matching parameter blocks

ui/shared/txt2img_ui.py

@@ -85,9 +85,9 @@ def create_ui():
                 components[f'result_{prefix}'] = gr.Gallery(
                     label="Result",
                     show_label=False,
-                    columns=1,
+                    columns=2,
                     object_fit="contain",
-                    height=505
+                    height=627
                 )