Codechange: rename str_validate to StrMakeValid(InPlace) (#9304)

This to be more explicit the function changes the value, and not
returns yes/no.

src/os/os2/os2.cpp

@@ -174,7 +174,7 @@ int CDECL main(int argc, char *argv[])
 	SetRandomSeed(time(nullptr));
 
 	/* Make sure our arguments contain only valid UTF-8 characters. */
-	for (int i = 0; i < argc; i++) ValidateString(argv[i]);
+	for (int i = 0; i < argc; i++) StrMakeValidInPlace(argv[i]);
 
 	return openttd_main(argc, argv);
 }

src/os/unix/unix.cpp

@@ -243,7 +243,7 @@ void CocoaReleaseAutoreleasePool();
 int CDECL main(int argc, char *argv[])
 {
 	/* Make sure our arguments contain only valid UTF-8 characters. */
-	for (int i = 0; i < argc; i++) ValidateString(argv[i]);
+	for (int i = 0; i < argc; i++) StrMakeValidInPlace(argv[i]);
 
 #ifdef WITH_COCOA
 	CocoaSetupAutoreleasePool();

src/os/windows/win32.cpp

@@ -429,7 +429,7 @@ int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLi
 	argc = ParseCommandLine(cmdline, argv, lengthof(argv));
 
 	/* Make sure our arguments contain only valid UTF-8 characters. */
-	for (int i = 0; i < argc; i++) ValidateString(argv[i]);
+	for (int i = 0; i < argc; i++) StrMakeValidInPlace(argv[i]);
 
 	openttd_main(argc, argv);