Update to new minui text API

Change-Id: Ic753564a397b90a9ba54660c78bec9c1a1ef583d
(cherry picked from commit 0ee524de689e27379eaa3d0af0152183b844b0e8)
diff --git a/healthd/healthd_mode_charger.cpp b/healthd/healthd_mode_charger.cpp
index 612885b..857bcb2 100644
--- a/healthd/healthd_mode_charger.cpp
+++ b/healthd/healthd_mode_charger.cpp
@@ -257,13 +257,13 @@
 
 static int draw_text(const char *str, int x, int y)
 {
-    int str_len_px = gr_measure(str);
+    int str_len_px = gr_measure(gr_sys_font(), str);
 
     if (x < 0)
         x = (gr_fb_width() - str_len_px) / 2;
     if (y < 0)
         y = (gr_fb_height() - char_height) / 2;
-    gr_text(x, y, str, 0);
+    gr_text(gr_sys_font(), x, y, str, 0);
 
     return y + char_height;
 }
@@ -364,7 +364,7 @@
         }
 
         gr_init();
-        gr_font_size(&char_width, &char_height);
+        gr_font_size(gr_sys_font(), &char_width, &char_height);
 
 #ifndef CHARGER_DISABLE_INIT_BLANK
         gr_fb_blank(true);