Fix snapshot tests and update PR title (#5314)

Updates outdated snapshots to match current LiteGraph behavior.

Author: christian-byrne

src/lib/litegraph/test/__snapshots__/ConfigureGraph.test.ts.snap

@@ -81,7 +81,6 @@ LGraph {
       "lostFocusAt": undefined,
       "mode": 0,
       "mouseOver": undefined,
-      "onMouseDown": [Function],
       "order": 0,
       "outputs": [],
       "progress": undefined,
@@ -151,7 +150,6 @@ LGraph {
       "lostFocusAt": undefined,
       "mode": 0,
       "mouseOver": undefined,
-      "onMouseDown": [Function],
       "order": 0,
       "outputs": [],
       "progress": undefined,
@@ -222,7 +220,6 @@ LGraph {
       "lostFocusAt": undefined,
       "mode": 0,
       "mouseOver": undefined,
-      "onMouseDown": [Function],
       "order": 0,
       "outputs": [],
       "progress": undefined,

src/lib/litegraph/test/__snapshots__/LGraph.test.ts.snap

@@ -83,7 +83,6 @@ LGraph {
       "lostFocusAt": undefined,
       "mode": 0,
       "mouseOver": undefined,
-      "onMouseDown": [Function],
       "order": 0,
       "outputs": [],
       "progress": undefined,
@@ -155,7 +154,6 @@ LGraph {
       "lostFocusAt": undefined,
       "mode": 0,
       "mouseOver": undefined,
-      "onMouseDown": [Function],
       "order": 0,
       "outputs": [],
       "progress": undefined,
@@ -228,7 +226,6 @@ LGraph {
       "lostFocusAt": undefined,
       "mode": 0,
       "mouseOver": undefined,
-      "onMouseDown": [Function],
       "order": 0,
       "outputs": [],
       "progress": undefined,

src/lib/litegraph/test/__snapshots__/LGraph_constructor.test.ts.snap

@@ -81,7 +81,6 @@ LGraph {
       "lostFocusAt": undefined,
       "mode": 0,
       "mouseOver": undefined,
-      "onMouseDown": [Function],
       "order": 0,
       "outputs": [],
       "progress": undefined,
@@ -151,7 +150,6 @@ LGraph {
       "lostFocusAt": undefined,
       "mode": 0,
       "mouseOver": undefined,
-      "onMouseDown": [Function],
       "order": 0,
       "outputs": [],
       "progress": undefined,
@@ -222,7 +220,6 @@ LGraph {
       "lostFocusAt": undefined,
       "mode": 0,
       "mouseOver": undefined,
-      "onMouseDown": [Function],
       "order": 0,
       "outputs": [],
       "progress": undefined,