correct use of tabs for plugins

.vim/after/ftplugin/tex.vim

@@ -0,0 +1,2 @@
+setlocal shiftwidth=4
+setlocal tabstop=4

.vim/snippets/cpp.snippets

@@ -2,8 +2,8 @@
 # main
 snippet main
 	int main(int argc, char* argv[]){
-	  ${1}
-	  return 0;
+		${1}
+		return 0;
 	}
 # std::cout
 snippet cout