global: Cleanup line lengths and misc lint warnings

I know we decided to ditch the idea of shutting up "Exception
thrown with empty param" warnings but this pesters me too
much and we can instead just treat this as a weird future proofing
thing if and when we end up needing the exception messages.

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

app/src/main/java/com/wireguard/android/util/RootShell.java

@@ -50,7 +50,7 @@ public class RootShell {
         final File cacheDir = context.getCacheDir();
         localBinaryDir = new File(cacheDir, "bin");
         localTemporaryDir = new File(cacheDir, "tmp");
-        preamble = String.format("export CALLING_PACKAGE=com.wireguard.android; export PATH=\"%s:$PATH\" TMPDIR='%s'; id -u\n",
+        preamble = String.format("export CALLING_PACKAGE=com.wireguard.android PATH=\"%s:$PATH\" TMPDIR='%s'; id -u\n",
                 localBinaryDir, localTemporaryDir);
     }