Everywhere: Fix format-vulnerabilities

Command used:
grep -Pirn '(out|warn)ln\((?!["\)]|format,|stderr,|stdout,|output, ")' \
     AK Kernel/ Tests/ Userland/
(Plus some manual reviewing.)

Let's pick ArgsParser as an example:
    outln(file, m_general_help);
This will fail at runtime if the general help happens to contain braces.

Even if this transformation turns out to be unnecessary in a place or
two, this way the code is "more obviously" correct.

Userland/Utilities/mktemp.cpp

@@ -110,7 +110,7 @@ int main(int argc, char** argv)
         return 1;
     }
 
-    outln(final_path);
+    outln("{}", final_path);
     free(final_path);
     return 0;
 }