Revert "charger: Draw battery percentage over charger screen"

This reverts commit f7e1ef2.

Rationale:
The tiny (blue) number drawn on top of the otherwise black-and-white
battery symbol looks pretty out of place and gives the perception of
being a debugging leftover that just was forgotten to be removed.
Additionally it's very unlikely the user is interested in the exact
value of battery charge in offmode charging. It's much more likely he's
interested in rough state information only ('is my battery fully charged
now?').

Change-Id: I2b4f881faa4a254d03e07d5d46b6870a2fe9ec4a

charger/charger.c

@@ -707,20 +707,6 @@ static void android_blue(void)
     gr_color(0, 191, 255, 255);
 }
 
-static void draw_capacity(struct charger *charger)
-{
-    char cap_str[64];
-    int x, y;
-    int str_len_px;
-
-    snprintf(cap_str, sizeof(cap_str), "%d%%", charger->batt_anim->capacity);
-    str_len_px = gr_measure(cap_str);
-    x = (gr_fb_width() - str_len_px) / 2;
-    y = (gr_fb_height() + char_height) / 2;
-    android_blue();
-    gr_text(x, y, cap_str, 0);
-}
-
 /* returns the last y-offset of where the surface ends */
 static int draw_surface_centered(struct charger *charger, gr_surface surface)
 {
@@ -773,10 +759,8 @@ static void redraw_screen(struct charger *charger)
     /* try to display *something* */
     if (batt_anim->capacity < 0 || batt_anim->num_frames == 0)
         draw_unknown(charger);
-    else {
+    else
         draw_battery(charger);
-        draw_capacity(charger);
-    }
     gr_flip();
 }