Prepend default line length arguments instead of appending them

Currently, the default line length arguments for the gfortran linter are appended AFTER the users extraArgs. Since in gfortran, the last occurrence of an argument that is passed multiple times will be taken, the default line length arguments will always overwrite what a user has explicitly set in extraArgs.

By prepending the default line length arguments instead, a user should now have the possibility to overwrite the default.

src/lint/provider.ts

@@ -555,7 +555,7 @@ export class FortranLintingProvider {
     if (this.linter.name === 'gfortran') {
       const ln: number = config.get('fortls.maxLineLength');
       const lnStr: string = ln === -1 ? 'none' : ln.toString();
-      args.push(`-ffree-line-length-${lnStr}`, `-ffixed-line-length-${lnStr}`);
+      args.unshift(`-ffree-line-length-${lnStr}`, `-ffixed-line-length-${lnStr}`);
     }
     if (args.length > 0) this.logger.debug(`[lint] arguments:`, args);