Fix credentials naming to match class name

credentials/HttpBin.credentials.ts

@@ -1,39 +0,0 @@
-import {
-	IAuthenticateHeaderAuth,
-	ICredentialTestRequest,
-	ICredentialType,
-	INodeProperties,
-} from "n8n-workflow";
-
-export class HttpBinApi implements ICredentialType {
-	name = "httpbinApi";
-	displayName = "HttpBin API";
-	documentationUrl = "httpbin";
-	properties: INodeProperties[] = [
-		{
-			displayName: "API Key",
-			name: "apiKey",
-			type: "string",
-			default: "",
-		},
-		{
-			displayName: "Domain",
-			name: "domain",
-			type: "string",
-			default: "https://httpbin.org",
-		},
-	];
-	authenticate = {
-		type: "headerAuth",
-		properties: {
-			name: "api-key",
-			value: "={{$credentials.apiKey}}",
-		},
-	} as IAuthenticateHeaderAuth;
-	test: ICredentialTestRequest = {
-		request: {
-			baseURL: "={{$credentials?.domain}}/v3",
-			url: "/account",
-		},
-	};
-}