FS-7506: make core specify default font instead of each place we use it

src/mod/applications/mod_conference/mod_conference.c

@@ -1251,7 +1251,7 @@ static void layer_set_banner(conference_member_t *member, mcu_layer_t *layer, co
 	const char *bg = "#142e55";
 	char *parsed = NULL;
 	switch_event_t *params = NULL;
-	const char *font_face = "/usr/share/fonts/truetype/freefont/FreeSansOblique.ttf";
+	const char *font_face = NULL;
 	const char *var, *tmp = NULL;
 	char *dup = NULL;
 	

src/mod/applications/mod_cv/mod_cv.cpp

@@ -287,10 +287,6 @@ static void stop_ticker(cv_context_t *context)
 static void set_ticker(cv_context_t *context, const char *fg, const char *bg, const char *font_face, const char *fontsz, int speed, switch_img_position_t pos, const char *text)
 {
 
-    if (zstr(font_face)) {
-        font_face = "FreeMono.ttf";
-    }
-
     if (zstr(fg)) {
         fg = "#cccccc";
     }
@@ -362,11 +358,6 @@ static int add_text(cv_context_t *context, const char *nick, const char *fg, con
         }
     }
 
-
-    if (zstr(font_face)) {
-        font_face = "FreeMono.ttf";
-    }
-
     if (zstr(fg)) {
         fg = "#cccccc";
     }