Fix for Bug 4074. This seems to be just a typo-error, because the Tesseract API…

Fix for Bug 4074. This seems to be just a typo-error, because the Tesseract API can handle correctly with RGB images (double-checked and it works).

modules/text/src/ocr_tesseract.cpp

@@ -127,7 +127,7 @@ public:
              int component_level=0)
     {
 
-        CV_Assert( (image.type() == CV_8UC1) || (image.type() == CV_8UC1) );
+        CV_Assert( (image.type() == CV_8UC1) || (image.type() == CV_8UC3) );
 
 #ifdef HAVE_TESSERACT