cmd/cli: make the run command output consistent with cairo-run (#329)

cairo-run v0.11-0.13 pad the output lines with two spaces.
There is no real reason to use tabs here.

cmd/cli/main.go

@@ -132,7 +132,8 @@ func main() {
 					if len(output) > 0 {
 						fmt.Println("Program output:")
 						for _, val := range output {
-							fmt.Printf("\t%s\n", val)
+							// cairo-run v0.11-0.13 pad the output lines with two spaces.
+							fmt.Printf("  %s\n", val)
 						}
 					}
 					return nil

integration_tests/cairozero_test.go

@@ -272,7 +272,7 @@ func TestPedersen(t *testing.T) {
 
 	_, _, output, err := runVm(compiledOutput)
 	require.NoError(t, err)
-	require.Contains(t, output, "Program output:\n\t2089986280348253421170679821480865132823066470938446095505822317253594081284")
+	require.Contains(t, output, "Program output:\n  2089986280348253421170679821480865132823066470938446095505822317253594081284")
 
 	clean("./builtin_tests/")
 }
@@ -305,7 +305,7 @@ func TestKeccak(t *testing.T) {
 
 	_, _, output, err := runVm(compiledOutput)
 	require.NoError(t, err)
-	require.Contains(t, output, "Program output:\n\t1304102964824333531548398680304964155037696012322029952943772\n\t688749063493959345342507274897412933692859993314608487848187\n\t986714560881445649520443980361539218531403996118322524237197\n\t1184757872753521629808292433475729390634371625298664050186717\n\t719230200744669084408849842242045083289669818920073250264351\n\t1543031433416778513637578850638598357854418012971636697855068\n\t63644822371671650271181212513090078620238279557402571802224\n\t879446821229338092940381117330194802032344024906379963157761\n")
+	require.Contains(t, output, "Program output:\n  1304102964824333531548398680304964155037696012322029952943772\n  688749063493959345342507274897412933692859993314608487848187\n  986714560881445649520443980361539218531403996118322524237197\n  1184757872753521629808292433475729390634371625298664050186717\n  719230200744669084408849842242045083289669818920073250264351\n  1543031433416778513637578850638598357854418012971636697855068\n  63644822371671650271181212513090078620238279557402571802224\n  879446821229338092940381117330194802032344024906379963157761\n")
 
 	clean("./builtin_tests/")
 }