Change icon for gradle files to Java (#1017)

* Change icon for gradle files to Java

Gradle files are for the whole Java ecosystem. Not just Android.

* Change the icon for jar & java to 

Other java related files (class, jad, war) already use this.

src/output/icons.rs

@@ -69,7 +69,7 @@ lazy_static! {
         m.insert("Dockerfile", '\u{f308}'); // 
         m.insert("ds_store", '\u{f179}'); // 
         m.insert("gitignore_global", '\u{f1d3}'); // 
-        m.insert("gradle", '\u{e70e}'); // 
+        m.insert("gradle", '\u{e256}'); // 
         m.insert("gruntfile.coffee", '\u{e611}'); // 
         m.insert("gruntfile.js", '\u{e611}'); // 
         m.insert("gruntfile.ls", '\u{e611}'); // 
@@ -188,7 +188,7 @@ pub fn icon_for_file(file: &File<'_>) -> char {
             "gitignore"     => '\u{f1d3}', // 
             "gitmodules"    => '\u{f1d3}', // 
             "go"            => '\u{e626}', // 
-            "gradle"        => '\u{e70e}', // 
+            "gradle"        => '\u{e256}', // 
             "groovy"        => '\u{e775}', // 
             "gsheet"        => '\u{f1c3}', // 
             "gslides"       => '\u{f1c4}', // 
@@ -208,8 +208,8 @@ pub fn icon_for_file(file: &File<'_>) -> char {
             "ipynb"         => '\u{e606}', // 
             "iso"           => '\u{e271}', // 
             "jad"           => '\u{e256}', // 
-            "jar"           => '\u{e204}', // 
-            "java"          => '\u{e204}', // 
+            "jar"           => '\u{e256}', // 
+            "java"          => '\u{e256}', // 
             "jfi"           => '\u{f1c5}', // 
             "jfif"          => '\u{f1c5}', // 
             "jif"           => '\u{f1c5}', // 