Fix type: char -> uint8_t (#337)

Author: Rotzbua

src/OLEDDisplay.cpp

@@ -537,7 +537,7 @@ void OLEDDisplay::drawXbm(int16_t xMove, int16_t yMove, int16_t width, int16_t h
   }
 }
 
-void OLEDDisplay::drawIco16x16(int16_t xMove, int16_t yMove, const char *ico, bool inverse) {
+void OLEDDisplay::drawIco16x16(int16_t xMove, int16_t yMove, const uint8_t *ico, bool inverse) {
   uint16_t data;
 
   for(int16_t y = 0; y < 16; y++) {

src/OLEDDisplay.h

@@ -238,7 +238,7 @@ class OLEDDisplay : public Stream {
     void drawXbm(int16_t x, int16_t y, int16_t width, int16_t height, const uint8_t *xbm);
 
     // Draw icon 16x16 xbm format
-    void drawIco16x16(int16_t x, int16_t y, const char *ico, bool inverse = false);
+    void drawIco16x16(int16_t x, int16_t y, const uint8_t *ico, bool inverse = false);
 
     /* Text functions */