[IMP] Static argument parameter instead of default

Don't support default value but use it as static value. It's dangerous
if it can be overwritten by parameter. Additionally, it might have
problem with type casting.

refs KIME-4583

Classes/WE/SpreadsheetImport/FrontendMappingService.php

@@ -46,8 +46,11 @@ class FrontendMappingService {
 		if (is_array($contextArguments)) {
 			foreach ($contextArguments as $contextArgument) {
 				$name = $contextArgument['name'];
-				$default = isset($contextArgument['default']) ? $contextArgument['default'] : NULL;
-				$arguments[$name] = $request->hasArgument($name) ? $request->getArgument($name) : $default;
+				if (isset($contextArgument['static'])) {
+					$arguments[$name] = $contextArgument['static'];
+				} else {
+					$arguments[$name] = $request->hasArgument($name) ? $request->getArgument($name) : NULL;
+				}
 			}
 		}
 		return $arguments;

Classes/WE/SpreadsheetImport/SpreadsheetImportService.php

@@ -355,11 +355,9 @@ class SpreadsheetImportService {
 					} else {
 						$value = $arguments[$name];
 					}
-				} else {
-					$value = array_key_exists('default', $contextArgument) ? $contextArgument['default'] : NULL;
+					$setter = 'set' . ucfirst($name);
+					$object->$setter($value);
 				}
-				$setter = 'set' . ucfirst($name);
-				$object->$setter($value);
 			}
 		}
 	}