Fix missing texture not being properly uploaded to memory

src/main/kotlin/ru/dbotthepony/kstarbound/client/StarboundClient.kt

@@ -397,7 +397,7 @@ class StarboundClient : Closeable {
 			}
 		}
 
-		buffer.position()
+		buffer.position(0)
 		missingTexture.upload(GL_RGB, GL_UNSIGNED_BYTE, buffer)
 	}
 
@@ -477,7 +477,7 @@ class StarboundClient : Closeable {
 				val data = Image.get(it)
 
 				if (data == null) {
-					LOGGER.error("Texture $it is not found, falling back to missing texture")
+					LOGGER.error("Texture $it is not found!")
 					missingTexture
 				} else {
 					val tex = GLTexture2D(data.width, data.height, when (data.amountOfChannels) {