Update crates/spk-cli/common/src/flags.rs

Co-authored-by: jrray <jrray@jrray.org>
Signed-off-by: dcookspi <92065525+dcookspi@users.noreply.github.com>

crates/spk-cli/common/src/flags.rs

@@ -1138,7 +1138,7 @@ pub struct DecisionFormatterSettings {
     /// Override the default solver output filename prefix. The
     /// current date, time, and solver kind name will be appended to
     /// this prefix to produce the file name for each solver.
-    #[clap(long, default_value_t=String::from(DEFAULT_SOLVER_RUN_FILE_PREFIX), env = SPK_OUTPUT_FILE_PREFIX)]
+    #[clap(long, default_value_t=String::from(DEFAULT_SOLVER_RUN_FILE_PREFIX), env = SPK_SOLVER_OUTPUT_FILE_PREFIX)]
     output_file_prefix: String,
 }