fixing all "argc < 1" to avoid segmentation fault when calling the module with no parameters

argc is never smaller than one because the first element of the array is the program name!

src/modules/local_position_estimator/local_position_estimator_main.cpp

@@ -95,7 +95,7 @@ usage(const char *reason)
 int local_position_estimator_main(int argc, char *argv[])
 {
 
-	if (argc < 1) {
+	if (argc < 2) {
 		usage("missing command");
 	}