feat: fix the naming in ln-pi

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---

Author: DivyanshuVortex

lib/node_modules/@stdlib/constants/float16/ln-pi/test/test.js

@@ -21,18 +21,18 @@
 // MODULES //
 
 var tape = require( 'tape' );
-var LN_PI = require( './../lib' );
+var FLOAT16_LN_PI = require( './../lib' );
 
 
 // TESTS //
 
 tape( 'main export is a number', function test( t ) {
 	t.ok( true, __filename );
-	t.strictEqual( typeof LN_PI, 'number', 'main export is a number' );
+	t.strictEqual( typeof FLOAT16_LN_PI, 'number', 'main export is a number' );
 	t.end();
 });
 
 tape( 'export is a half-precision floating-point number equal to `1.14453125`', function test( t ) {
-	t.strictEqual( LN_PI, 1.14453125, 'returns expected value' );
+	t.strictEqual( FLOAT16_LN_PI, 1.14453125, 'returns expected value' );
 	t.end();
 });