LibGfx: Add the TGA format into the list of bitmap formats :^)

Userland/Libraries/LibGfx/Bitmap.h

@@ -26,7 +26,8 @@
     __ENUMERATE_IMAGE_FORMAT(jpg, ".jpg")  \
     __ENUMERATE_IMAGE_FORMAT(jpg, ".jpeg") \
     __ENUMERATE_IMAGE_FORMAT(dds, ".dds")  \
-    __ENUMERATE_IMAGE_FORMAT(qoi, ".qoi")
+    __ENUMERATE_IMAGE_FORMAT(qoi, ".qoi")  \
+    __ENUMERATE_IMAGE_FORMAT(tga, ".tga")
 
 namespace Gfx {