Game client warnings: Update warning for "found broken maps" to be si…

…lent. (#12755)

The pop-up on every game launch without a button to delete the map is annoying..

game-app/map-data/src/main/java/org/triplea/map/description/file/MapDescriptionYaml.java

@@ -145,7 +145,10 @@ boolean isValid(final Path sourceFile) {
     }
 
     if (!validationErrors.isEmpty()) {
-      log.warn("Error found in: {}, errors: {}", sourceFile.toAbsolutePath(), validationErrors);
+      log.info(
+          "Warning: invalid map found installed: {}, errors: {}",
+          sourceFile.toAbsolutePath(),
+          validationErrors);
     }
 
     return validationErrors.isEmpty();