Fix MTF_Bayer.java string literal broken by sed GPL header fix

The previous sed replacement of 'tMTF_Bayer.java' matched across the '\t'
tab escape in a string literal, producing illegal '\M' escape. Restored \t.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/main/java/com/elphel/imagej/calibration/MTF_Bayer.java

@@ -1627,7 +1627,7 @@ Next is restoration of the original shifts and scales applied before accumulatin
 
   new TextWindow(title_src+"_"+"pixel crosstalk", "Item                       \tDescription",
   "LICENSE"+
-  "\MTF_Bayer.java is free software: you can redistribute it and/or modify\n"+
+  "\tMTF_Bayer.java is free software: you can redistribute it and/or modify\n"+
   "\tit under the terms of the GNU General Public License as published by\n"+
   "\tthe Free Software Foundation, either version 3 of the License, or\n"+
   "\t(at your option) any later version.\n"+