change exr file to hdr for proper loading. (#8351)

Author: NickHardeman

examples/graphics/floatingPointImageExample/bin/data/nyc-small.exr

@@ -30,7 +30,7 @@ void ofApp::setup(){
 	//if you uncomment the appropriate line in main.cpp
 
 	img.setUseTexture(false);
-	img.load("nyc-small.exr");
+	img.load("nyc-small.hdr");
 
 	material.setShininess(120);
 	material.setSpecularColor(ofColor(255, 255, 255, 255));