skip shebang in the first line

Something like this works now:

===
% PATH="./bin:$PATH" ./sum.ktscript 31 21
31 + 21 = 52

% cat sum.ktscript
#!/usr/bin/env kotlin -script

val a = Integer.parseInt(args[0])
val b = Integer.parseInt(args[1])
println("$a + $b = ${a + b}")
===

compiler/testData/psi/script/ShebangIncorrect.ktscript

@@ -0,0 +1,3 @@
+println(1); #!/usr
+
+#!/hi