fix(editor): Nodes' icon color in dark mode (#12279)

packages/@n8n/nodes-langchain/nodes/memory/MemoryBufferWindow/MemoryBufferWindow.node.ts

@@ -78,6 +78,7 @@ export class MemoryBufferWindow implements INodeType {
 		displayName: 'Window Buffer Memory (easiest)',
 		name: 'memoryBufferWindow',
 		icon: 'fa:database',
+		iconColor: 'black',
 		group: ['transform'],
 		version: [1, 1.1, 1.2, 1.3],
 		description: 'Stores in n8n memory, so no credentials required',

packages/@n8n/nodes-langchain/nodes/memory/MemoryChatRetriever/MemoryChatRetriever.node.ts

@@ -38,6 +38,7 @@ export class MemoryChatRetriever implements INodeType {
 		displayName: 'Chat Messages Retriever',
 		name: 'memoryChatRetriever',
 		icon: 'fa:database',
+		iconColor: 'black',
 		group: ['transform'],
 		hidden: true,
 		version: 1,

packages/@n8n/nodes-langchain/nodes/memory/MemoryMotorhead/MemoryMotorhead.node.ts

@@ -19,6 +19,7 @@ export class MemoryMotorhead implements INodeType {
 		displayName: 'Motorhead',
 		name: 'memoryMotorhead',
 		icon: 'fa:file-export',
+		iconColor: 'black',
 		group: ['transform'],
 		version: [1, 1.1, 1.2, 1.3],
 		description: 'Use Motorhead Memory',