clean up C snippets

lua/snippets/c.lua

@@ -7,9 +7,7 @@ return {
       t(""),
       t("static "),
     }),
-    t("int "),
+    t("int main("),
-    t("main"),
-    t("("),
     c(2, {
       t("int argc, char *argv[]"),
       i(1, "void"),
@@ -44,5 +42,5 @@ return {
     t({ "", "{", "\t" }),
     i(0),
     t({ "", "}" }),
-})
+  })
 }