Fix test cases for nerdfont#path#basename and nerdfont#path#extension

The glyphs were changed in the following commit:
339e5e0

Author: lambdalisue

test/nerdfont/path/basename.vimspec

@@ -7,12 +7,12 @@ Describe nerdfont#path#basename
 
     It returns a Docker glyph for 'dockerfile'
       let glyph = nerdfont#path#basename#find('dockerfile')
-      Assert Equals(glyph, '')
+      Assert Equals(glyph, '')
     End
 
     It returns a Key glyph for 'license'
       let glyph = nerdfont#path#basename#find('license')
-      Assert Equals(glyph, '')
+      Assert Equals(glyph, '')
     End
 
     It returns an empty string for 'hogehogefoobar'

test/nerdfont/path/extension.vimspec

@@ -12,7 +12,7 @@ Describe nerdfont#path#extension
 
     It returns a Ruby glyph for 'index.rb'
       let glyph = nerdfont#path#extension#find('index.rb')
-      Assert Equals(glyph, '')
+      Assert Equals(glyph, '')
     End
 
     It returns an empty string for 'hogehogefoobar'