Remove unused method

Author: marcphilipp

junit-platform-launcher/src/main/java/org/junit/platform/launcher/core/LauncherConfigurationParameters.java

@@ -155,10 +155,6 @@ private interface ParameterProvider {
 		@Nullable
 		String getValue(String key);
 
-		default int size() {
-			return 0;
-		}
-
 		Set<String> keySet();
 
 		static ParameterProvider explicit(Map<String, String> configParams) {
@@ -168,11 +164,6 @@ static ParameterProvider explicit(Map<String, String> configParams) {
 					return configParams.get(key);
 				}
 
-				@Override
-				public int size() {
-					return configParams.size();
-				}
-
 				@Override
 				public Set<String> keySet() {
 					return configParams.keySet();