chore(lambda): match enum value to property (aws#30472)

Looks like we are comparing `LogFormat` to the `LoggingFormat` enum. This is not technically a problem for us because `LogFormat` is a string. We deprecated it and created `LoggingFormat` to enforce the enum.

This conditional works because all the enums collapse to strings, but it is best if we sync up the properties with their correct enums.

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packages/aws-cdk-lib/aws-lambda/lib/function.ts

@@ -1179,7 +1179,7 @@ export class Function extends FunctionBase {
     }
 
     if (props.applicationLogLevel || props.applicationLogLevelV2 || props.systemLogLevel || props.systemLogLevelV2) {
-      if (props.logFormat !== LoggingFormat.JSON && props.loggingFormat === undefined) {
+      if (props.logFormat !== LogFormat.JSON && props.loggingFormat === undefined) {
         throw new Error(`To use ApplicationLogLevel and/or SystemLogLevel you must set LogFormat to '${LogFormat.JSON}', got '${props.logFormat}'.`);
       }