Show Fortran logo for code with fortranfree instead of fortran

lectures/custom.scss

@@ -95,7 +95,7 @@ kbd, .kbd {
   background-position: right top; 
 }
 
-.sourceCode > pre.fortran > code.fortran {
+.sourceCode > pre.fortranfree > code.fortranfree {
   background: url('data:image/png;base64,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');
   background-repeat: no-repeat;
   background-attachment: fixed;