Fix wall clock with 12h format

Stock strftime doesn't use capitalized "P", so for example on Windows
the wall clock didn't appear for 12h format. PM and AM are converted
to lowercase.

config/menus_settings.cfg

@@ -503,7 +503,7 @@ menuitem [Reset to default scoreboard...] [ loop rsl (listlen $DEFAULT_SCOREBOAR
 menuitem [Close] [ closecurmenu ]
 
 alias wallclockformat "" // strftime formatting
-alias wallclockformatlist ["" %H:%M %H:%M:%S %I:%M%P %I:%M:%S%P U%H:%M U%H:%M:%S] //"U" at beginning means UTC/GMT time
+alias wallclockformatlist ["" %H:%M %H:%M:%S %I:%M%p %I:%M:%S%p U%H:%M U%H:%M:%S] //"U" at beginning means UTC/GMT time
 
 newmenu HUD
 

source/src/renderhud.cpp

@@ -841,7 +841,7 @@ void gl_drawhud(int w, int h, int curfps, int nquads, int curvert, bool underwat
     const char *ltimeformat = getalias("wallclockformat");
     bool wallclock = ltimeformat && *ltimeformat;
     //wallclockformat beginning with "U" shows UTC/GMT time
-    if(wallclock) formatstring(ltime)("%s", timestring(*ltimeformat != 'U', ltimeformat + int(*ltimeformat == 'U')));
+    if(wallclock) filtertext(ltime, timestring(*ltimeformat != 'U', ltimeformat + int(*ltimeformat == 'U')), FTXT_TOLOWER);
 
     if(showstats)
     {