obs-text: Reload whenever file timestamp has changed

Rather than reload when the timestamp is greater than the previous
timestamp, reload whenever the timestamp has changed.

plugins/obs-text/gdiplus/obs-text.cpp

@@ -736,7 +736,7 @@ inline void TextSource::Tick(float seconds)
 		time_t t = get_modified_timestamp(file.c_str());
 		update_time_elapsed = 0.0f;
 
-		if (file_timestamp < t) {
+		if (file_timestamp != t) {
 			LoadFileText();
 			RenderText();
 			file_timestamp = t;