time_zone_manager: Stop on comma

This is a deviation from the reference time zone implementation. The
actual code will set a pointer to the time zone name here, but for us we
have a limited number of characters to work with, and the name of the
time zone here could be larger than 8 characters.

We can make the assumption that time zone names greater than five
characters in length include a comma that denotes more data. Nintendo
just truncates that data for the name, so we can do the same.

time_zone_manager: Check for length of array

Just to be double sure that we never break past the array length,
directly compare against it.

src/core/hle/service/time/time_zone_manager.cpp

@@ -911,7 +911,9 @@ static Result ToCalendarTimeInternal(const TimeZoneRule& rules, s64 time,
 
     calendar_additional_info.is_dst = rules.ttis[tti_index].is_dst;
     const char* time_zone{&rules.chars[rules.ttis[tti_index].abbreviation_list_index]};
-    for (int index{}; time_zone[index] != '\0'; ++index) {
+    for (u32 index{}; time_zone[index] != '\0' && time_zone[index] != ',' &&
+                      index < calendar_additional_info.timezone_name.size() - 1;
+         ++index) {
         calendar_additional_info.timezone_name[index] = time_zone[index];
     }
     return ResultSuccess;