Rename --blueprint-input to --in

The context is indeed sufficient as pointed by @nemo83; no need to make the cli needlessly verbose.

crates/aiken/src/cmd/blueprint/apply.rs

@@ -26,9 +26,10 @@ pub struct Args {
     /// `plutus.json`), or use the `cbor.serialise` function from the Aiken standard library.
     parameter: Option<String>,
 
-    /// Path to a blueprint file to be used as input.
-    #[clap(short = 'b', long, value_parser)]
-    blueprint_input: Option<PathBuf>,
+    /// Optional path to the blueprint file to be used as input. Default to 'plutus.json' when
+    /// omitted.
+    #[clap(short, long = "in", value_parser)]
+    input: Option<PathBuf>,
 
     /// Output file. Optional, print on stdout when omitted.
     #[clap(short, long)]
@@ -46,7 +47,7 @@ pub struct Args {
 pub fn exec(
     Args {
         parameter,
-        blueprint_input,
+        input,
         out,
         module,
         validator,
@@ -108,7 +109,7 @@ pub fn exec(
                     })
             }
 
-            None => p.construct_parameter_incrementally(title, &blueprint_input, ask_schema)?,
+            None => p.construct_parameter_incrementally(title, &input, ask_schema)?,
         };
 
         eprintln!(