Use positional arguments in all translatable fmt strings

We want to use positional arguments in translatable strings
that have more than one argument so that translators can change
the order of them, but the question is: Should we also use
positional arguments in translatable strings with only one
argument? I think it makes most sense that way, partially
so that translators don't even have to be aware of the
non-positional syntax and partially because "translatable
strings use positional arguments" is an easier rule for us
to remember than "transitional strings which have more than
one argument use positional arguments". But let me know if
you have a different opinion.

Source/Core/InputCommon/InputConfig.cpp

@@ -73,7 +73,7 @@ bool InputConfig::LoadConfig(bool isGC)
           if (profiles.empty())
           {
             // TODO: PanicAlert shouldn't be used for this.
-            PanicAlertFmtT("No profiles found for game setting '{}'", profile_setting);
+            PanicAlertFmtT("No profiles found for game setting '{0}'", profile_setting);
             continue;
           }